CN216571630U - Sodium sulfate quadruple effect evaporation crystallization device - Google Patents

Abstract

The utility model discloses a sodium sulfate four-effect evaporative crystallization device, which comprises a first-effect separator, a second-effect separator, a third-effect separator, a fourth-effect separator, a first-effect heater, a second-effect heater, a third-effect heater and a fourth-effect heater, wherein the first-effect separator is connected with the second-effect separator; the first-effect separation outlet of the first-effect separator is communicated with the first-effect heating inlet of the first-effect heater through a first-effect circulating pump and is communicated with the second-effect separation inlet of the second-effect separator through a first-effect material transferring pump; the input end of the first-effect circulating pump is connected with a feeding pump. The sodium sulfate four-effect evaporative crystallization device adopts a circulating evaporative crystallization mode, can carry out evaporative crystallization on sodium sulfate solutions with various concentrations, and prevents pipe blockage caused by feed concentration change; moreover, this device adopts the mode of quadruple effect evaporation, and make full use of steam heat is to the material heat transfer to reduce steam consumption, reduce treatment cost.

Description

Sodium sulfate quadruple effect evaporation crystallization device

Technical Field

The utility model relates to the technical field of evaporative crystallization devices, in particular to a sodium sulfate four-effect evaporative crystallization device.

Background

The sodium sulfate evaporative crystallizer is a device for evaporating and crystallizing a sodium sulfate solution, and achieves the aim of separating brine by evaporating and crystallizing the sodium sulfate solution. When the sodium sulfate evaporative crystallizer operates, the sodium sulfate-containing solution material enters an evaporator circulating pipe from a raw material pump after being preheated, the temperature rises after being heated by a heat exchanger, the solution descends to the bottom of the evaporator, then is pumped into the heat exchanger under the suction of a circulating pump for heating, enters the next circulation, and is discharged when the solid-to-liquid ratio of crystal mush meets the requirement; the material is heated by a heater and then enters a separator for evaporation, the evaporation process is continuously carried out in a fully closed state, the temperature, the pressure and the material liquid concentration in a sodium sulfate evaporation crystallizer can be kept in a suitable evaporation state, the material heated by the heater enters the crystallizer, and a vapor-liquid mixture is evaporated and separated in the evaporator.

However, when the existing sodium sulfate evaporation crystallization device runs, the concentration of the material is gradually increased along with the continuous evaporation, and after the feeding concentration is increased, the pipe blockage is easily generated in the membrane evaporator, so that the normal flow of the material is influenced; most of the existing sodium sulfate evaporative crystallizers are single-effect, redundant heat in the evaporative crystallization process cannot be fully utilized, so that steam consumption is high, energy consumption of evaporative crystallization is increased, and in the evaporative treatment process, too much cooling water is used, so that the treatment cost is increased; in addition, after the solution is boiled and evaporated, the retention time of crystals in the evaporator is too short, so that the deposited crystal particles are too small, the materials are easily leaked out by a centrifugal machine during centrifugal treatment, and the normal solid-liquid separation effect is influenced.

Therefore, there is a need for improvement of the sodium sulfate four-effect evaporation crystallization device in the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and provide a sodium sulfate four-effect evaporation crystallization device which saves energy consumption, reduces cooling water consumption, avoids material leakage of a centrifugal machine and prevents pipe blockage caused by concentration increase.

In order to realize the technical effects, the technical scheme of the utility model is as follows: a sodium sulfate four-effect evaporation crystallization device comprises a first-effect separator, a second-effect separator, a third-effect separator, a fourth-effect separator, a first-effect heater, a second-effect heater, a third-effect heater and a fourth-effect heater; the primary-effect separation outlet of the primary-effect separator is communicated with the primary-effect heating inlet of the primary-effect heater through a primary-effect circulating pump and is communicated with the secondary-effect separation inlet of the secondary-effect separator through a primary-effect material transferring pump, and the primary-effect heating outlet of the primary-effect heater is communicated with the primary-effect separation inlet of the primary-effect separator; the input end of the first-effect circulating pump is connected with a feeding pump; a secondary-effect separation outlet of the secondary-effect separator is communicated with a secondary-effect heating inlet of the secondary-effect heater through a secondary-effect circulating pump and is communicated with a tertiary-effect separation inlet of the tertiary-effect separator through a secondary-effect material transferring pump, and a secondary-effect heating outlet of the secondary-effect heater is communicated with the secondary-effect separation inlet; the three-effect separation outlet of the three-effect separator is communicated with the three-effect heating inlet of the three-effect heater through a three-effect circulating pump and is communicated with the four-effect separation inlet of the four-effect separator through a three-effect material transferring pump, and the three-effect heating outlet of the three-effect heater is communicated with the three-effect separation inlet; the bottom of four-effect separator is provided with the four-effect salt leg, the four-effect separation export of four-effect separator pass through the four-effect circulating pump with the four-effect heating import intercommunication of four-effect heater, the four-effect salt leg passes through the four-effect discharge pump and solid-liquid separation device intercommunication, the four-effect heating export of four-effect heater with the four-effect separation import intercommunication.

When the sodium sulfate four-effect evaporative crystallization device of the technical scheme operates, a material stock solution containing sodium sulfate is conveyed into the one-effect separator through the one-effect separation inlet by the feed pump, the material flows out of the one-effect separation outlet, is conveyed into the one-effect heater from the one-effect heating inlet by the one-effect circulating pump, flows out of the one-effect heating outlet after exchanging heat with steam in the one-effect heater, and then enters the one-effect separator through the one-effect separation inlet. The circulation enables the materials to circularly flow between the first-effect separator and the first-effect heater and heat the materials, the temperature of the heated materials is raised, the materials are boiled and evaporated in the first-effect separator, the concentration is increased, and crystals are separated out.

After the material concentration rises to the certain degree, the material flows from one imitates the separation export, changes the material pump through one and carries to two imitate heating import department, and the material gets into to two imitates the heater in from two imitate heating import, makes its temperature rise with steam heat transfer in two imitates the heater, and then the material is discharged from two imitates the heating export, in getting into two imitate separators through two imitates the separation import, discharges from two imitate separation exports again, under the impetus of two imitate circulating pump, gets into to two imitates the heater in from two imitate heating import department. Therefore, the materials circularly flow in the two-effect separator and the two-effect heater, the temperature of the materials is raised, the materials after being heated continue to evaporate and crystallize in the two-effect separator, and crystals are separated out.

When the concentration of the materials continuously rises to a certain degree, the materials flow out of the two-effect separation outlet, are conveyed to the three-effect heating inlet through the two-effect material transfer pump, enter the three-effect heater, exchange heat with steam flowing in the three-effect heater to ensure that the materials continuously rise in temperature, are discharged from the three-effect heating outlet, enter the three-effect separator through the three-effect separation inlet, are discharged from the three-effect separation outlet, and enter the three-effect heater through the three-effect heating inlet under the pushing action of the three-effect circulating pump. Therefore, the materials circularly flow in the three-effect separator and the three-effect heater, the temperature of the materials is raised, the heated materials continue to evaporate and crystallize in the three-effect separator, and crystals are separated out.

When the concentration of the materials continues to rise to a certain degree, the materials flow out of the triple-effect separation outlet, enter the quadruple-effect heater from the quadruple-effect heating inlet under the pushing action of the triple-effect material-transferring pump, and are discharged from the quadruple-effect separation outlet, and under the pushing action of the quadruple-effect circulating pump, the materials enter the quadruple-effect separator through the quadruple-effect heating inlet, exchange heat with steam in the quadruple-effect separator, so that the materials enter the quadruple-effect separator from the quadruple-effect separation inlet after being heated. Circulating in such a way, so that the materials are boiled and evaporated in the four-effect separator, crystals are separated out through crystallization, and the separated crystals and the thick solution are settled at the four-effect salt leg; and then the precipitated crystals and the residual solution are conveyed to a solid-liquid separation device through a four-effect discharge pump to realize solid-liquid separation.

The device adopts a four-effect evaporation crystallization mode, and makes full use of steam to exchange heat with materials, thereby reducing the consumption of steam and the evaporation crystallization treatment cost of sodium sulfate; and when the four-effect evaporation treatment is carried out, forced circulation evaporation crystallization is adopted, so that pipe blockage caused by the change of the feeding concentration is prevented, and the smooth proceeding of the evaporation crystallization treatment of the sodium sulfate solution is ensured.

Preferably, the solid-liquid separation device comprises a thickener and a centrifuge, a thick inlet of the thickener is communicated with an output end of the four-effect discharge pump, a clear liquid overflow port is communicated with a mother liquid tank, a deposition outlet is communicated with a centrifugal inlet of the centrifuge, a centrifugal solid outlet of the centrifuge is communicated with the outside, and a centrifugal liquid outlet is communicated with the mother liquid tank; and the mother liquor tank is provided with a mother liquor outlet which is communicated with the four-effect salt leg through a mother liquor pump.

By adopting the technical scheme, the four-effect discharge pump conveys the crystal particles and the thick solution into the thickener for thickening treatment, clear liquid is discharged from a clear liquid overflow port and enters a mother liquid tank in the thickening treatment process, crystal slurry is settled at the bottom in the thickener and is discharged from a deposition outlet of the thickener and then enters the centrifuge; and (4) carrying out centrifugal separation treatment on the thick crystal slurry by using a centrifugal machine to obtain centrifugal solid, discharging the obtained centrifugal solid out of the system, and discharging the centrifugal liquid through a centrifugal liquid outlet to enter a mother liquor tank. And then, starting a mother liquor pump, extracting the solution in the mother liquor tank from a mother liquor outlet, conveying the solution to a four-effect salt leg, continuously depositing crystal particles in the mother liquor, performing separation treatment through a thickener and a centrifugal machine, and circulating the steps to realize solid-liquid separation.

Preferably, an effective hot water outlet and an effective balance port are arranged on the effective heater, the effective hot water outlet is communicated with a hot water tank, a hot water balance port is arranged on the hot water tank, and the hot water balance port is communicated with the effective balance port.

Through adopting above-mentioned technical scheme, steam carries out the heat transfer back with the material in an effect heater, and the steam condensation becomes hot water, gets into in the hot water jar after imitating hot water outlet discharge, and the balanced mouthful intercommunication of hot water is imitated with one, guarantees that the hot water that an effect heater produced can get into in the hot water jar smoothly. The hot water generated by the hot water tank can be used for preheating materials, the heat of the hot water is fully utilized, energy conservation and consumption reduction are realized, the water consumption is reduced, and the evaporation crystallization cost is reduced.

Preferably, the hot water tank is provided with a hot water outlet which is communicated with a hot water pump; still include hot water preheater, hot water preheater's heat medium import with the output intercommunication of hot-water pump, heat medium export and external intercommunication, the feed inlet with the output intercommunication of charge pump, the discharge gate with the input intercommunication of an effect circulating pump.

Through adopting above-mentioned technical scheme, the hot-water pump starts, follows the hot water in the hot water discharge port extraction hot water jar, carries to hot water pre-heater in, and hot water carries out the heat transfer with the material that flows in hot water pre-heater to the realization is to the intensification of material and is handled, and the hot water temperature after the heat transfer reduces, discharge system, and the material temperature risees, carries to one in imitating the heater through one imitates the circulating pump. Therefore, the heat of the steam is fully utilized, the water consumption is reduced, and the evaporation and crystallization cost is reduced.

Preferably, a secondary-effect condensate outlet is formed in the secondary-effect heater, a tertiary-effect condensate inlet and a tertiary-effect condensate outlet are formed in the tertiary-effect heater, and a four-effect condensate inlet, a four-effect condensate outlet and a four-effect balance port are formed in the four-effect heater; the second effect condensate outlet is communicated with the third effect condensate inlet, the third effect condensate outlet is communicated with the fourth effect condensate inlet, the fourth effect condensate outlet is communicated with a first condensate tank, a first condensation balance port is formed in the first condensate tank, and the first condensation balance port is communicated with the fourth effect balance port.

By adopting the technical scheme, steam exchanging heat with materials in the two-effect heater is condensed into hot water, the hot water is discharged through the two-effect condensate outlet, enters the three-effect heater from the three-effect condensate inlet for flash evaporation to form condensed hot water, is discharged through the three-effect condensate outlet, enters the four-effect heater from the four-effect condensate outlet for flash evaporation, is condensed into hot water, enters the first condensate tank, and stores the hot water through the first condensate tank so as to preheat the materials, thereby fully utilizing the heat of the hot water, saving the water consumption and reducing the evaporative crystallization cost; the first condensation balance port is communicated with the four-effect balance port, and hot water generated by the four-effect heater can smoothly enter the first condensate water tank.

Preferably, a first condensed water outlet is arranged on the first condensed water tank, and the first condensed water outlet is communicated with a first condensed water pump; the first condensate pump with be provided with the comdenstion water pre-heater between the charge pump, the feed inlet of comdenstion water pre-heater with the output intercommunication of charge pump, the discharge gate with the feed inlet intercommunication of hot water pre-heater, heat medium import with the output intercommunication of first condensate pump, heat medium export and external intercommunication.

Through adopting above-mentioned technical scheme, first condensate pump starts, extracts the hot water in the first condensate water jar from first condensate water export, carries it to the condensate water preheater in with the discharge material heat transfer of charge pump output for the material heaies up the back, and then heat transfer once more heaies up in the hot water preheater, and the condensate water heat after the heat transfer is then from heat medium export discharge system.

Preferably, a first-effect steam inlet of the first-effect heater is communicated with a steam generation source, a first-effect upper non-condensable gas outlet and a first-effect lower non-condensable gas outlet are communicated with a second-effect steam inlet of the second-effect heater, a second-effect upper non-condensable gas outlet and a second-effect lower non-condensable gas outlet of the second-effect heater are communicated with a third-effect steam inlet of the third-effect heater, and a third-effect upper non-condensable gas outlet and a third-effect lower non-condensable gas outlet are communicated with a fourth-effect steam inlet of the fourth-effect heater; still include the condenser, the condensate gas import of condenser with on the quadruple effect of quadruple effect heater the noncondensable gas export and quadruple effect noncondensable gas export intercommunication down, the condensate outlet intercommunication of condenser has second condensate water pitcher, be provided with the export of second comdensable water on the second condensate water pitcher, the export of second comdensable water is through second condensate water pump and external intercommunication.

By adopting the technical scheme, the raw steam source provides raw steam, the raw steam enters the first-effect heater through the first-effect steam inlet to exchange heat with materials, non-condensable gas generated in the first-effect heater is discharged through the first-effect upper non-condensable gas port and the first-effect lower non-condensable gas port, the non-condensable gas enters the second-effect heater from the second-effect steam inlet to exchange heat with the materials, the non-condensable gas generated in the second-effect heater is discharged through the second-effect upper non-condensable gas port and the second-effect lower non-condensable gas port, the non-condensable gas enters the third-effect heater from the third-effect steam inlet to exchange heat with the materials, the non-condensable gas generated in the third-effect heater is discharged from the third-effect upper non-condensable gas port and the third-effect lower non-condensable gas port, the non-condensable gas generated in the fourth-effect heater is discharged from the fourth-effect upper non-condensable gas port and the fourth-effect lower non-condensable gas port; then the non-condensable gas enters the condenser, forms condensed water after exchanging heat with circularly flowing cold water in the condenser, enters the second condensed water tank through the condensed water outlet, and then the second condensed water pump is started to discharge the condensed water in the second condensed water tank out of the system.

Preferably, a second air outlet is formed in the second condensed water tank, a condensed air outlet is formed in the condenser, and the second air outlet and the condensed air outlet are communicated with the outside through a vacuum pump.

Through adopting above-mentioned technical scheme, utilize the vacuum pump to extract the noncondensable gas in the condenser and the air in the second comdensable water jar from the condensation gas outlet to discharge system.

Preferably, a primary-effect secondary steam outlet of the primary-effect separator is communicated with a secondary-effect steam inlet of the secondary-effect heater, a secondary-effect secondary steam outlet of the secondary-effect separator is communicated with a tertiary-effect steam inlet of the tertiary-effect heater, a tertiary-effect secondary steam outlet of the tertiary-effect separator is communicated with a quaternary-effect steam inlet of the quaternary-effect heater, and a quaternary-effect secondary steam outlet of the quaternary-effect separator is communicated with a condensed gas inlet of the condenser.

By adopting the technical scheme, when the first-effect separator operates, generated secondary steam is discharged through the first-effect secondary steam outlet, enters the second-effect heater through the second-effect steam inlet, and exchanges heat with materials flowing in the second-effect heater; when the two-effect separator operates, the generated secondary steam is discharged through the two-effect secondary steam outlet, enters the three-effect heater through the three-effect steam inlet, and exchanges heat with the material flowing in the three-effect heater; when the three-effect separator operates, the generated secondary steam is discharged through the three-effect secondary steam outlet, enters the four-effect heater through the four-effect steam inlet, and exchanges heat with the material flowing in the four-effect heater; when the four-effect separator operates, the generated secondary steam is discharged through the four-effect secondary steam outlet and enters the condenser to exchange heat with circulating cold water flowing in the condenser. Therefore, secondary steam generated in the separation process is fully utilized to exchange heat with materials, the energy consumption is saved, the steam consumption is reduced, and the evaporation crystallization treatment cost is reduced.

Preferably, the four-effect separator is an OSLO crystallizer.

Through adopting above-mentioned technical scheme, behind the fourth separator adoption OSLO crystallizer, when carrying out the evaporation crystallization, can prolong the crystal and in the time of fourth separator dwell for the crystal particle that separates out gathers, with the size that increases the crystal particle, thereby effectively prevents to lead to the material running problem to appear among the centrifuge centrifugation separation process behind the sodium sulfate crystal particle undersize.

In conclusion, compared with the prior art, the sodium sulfate four-effect evaporation crystallization device provided by the utility model adopts a circulating evaporation crystallization mode, so that sodium sulfate solutions with various concentrations can be subjected to evaporation crystallization, and the phenomenon that a pipe is blocked due to the change of the feeding concentration is prevented; moreover, the device adopts a four-effect evaporation mode, and makes full use of steam heat to exchange heat with materials, thereby reducing steam consumption and treatment cost.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view showing the structure of an apparatus for evaporative crystallization of a material according to the present invention;

FIG. 3 is a schematic structural view of a solid-liquid separation apparatus according to the present invention;

FIG. 4 is a schematic view of a connection structure of a single-effect heater according to the present invention;

FIG. 5 is a schematic view of the connection structure of the four-effect heater of the present invention;

FIG. 6 is a schematic view showing the structure of an apparatus for heat exchange with steam according to the present invention;

FIG. 7 is a schematic view showing a connection structure of a condenser and a second condensed water tank according to the present invention;

in the figure: 1. the system comprises a primary-effect separator, a primary-effect separation inlet, a primary-effect separation outlet and a primary-effect secondary steam outlet, wherein the primary-effect separator is 1 a; 2. the system comprises a two-effect separator, a two-effect separation inlet, a two-effect separation outlet and a two-effect secondary steam outlet, wherein the two-effect separator comprises a 2a two-effect separation inlet, a 2b two-effect separation outlet and a 2c two-effect secondary steam outlet; 3. the system comprises a three-effect separator, a three-effect separation inlet, a three-effect separation outlet and a three-effect secondary steam outlet, wherein the three-effect separator is 3 a; 4. the system comprises a four-effect separator, a 4a four-effect separation inlet, a 4b four-effect separation outlet and a 4c four-effect secondary steam outlet; 5. the system comprises a first-effect heater, a first-effect heating inlet, a first-effect heating outlet, a first-effect steam inlet, a first-effect upper non-condensable gas outlet, a first-effect lower non-condensable gas outlet, a first-effect hot water outlet and a first-effect balance port, wherein the first-effect heater is 5a, the first-effect heating inlet is 5b, the first-effect heating outlet is 5c, the first-effect steam inlet is 5d, the first-effect upper non-condensable gas outlet is 5e, the first-effect lower non-condensable gas outlet is 5f, and the first-effect balance port is 5 g; 6. the system comprises a double-effect heater, a double-effect heating inlet, a double-effect heating outlet, a double-effect steam inlet, a double-effect upper non-condensable gas outlet, a double-effect lower non-condensable gas outlet and a double-effect condensate outlet, wherein 6a is the double-effect heating inlet, 6b is the double-effect heating outlet, 6c is the double-effect steam inlet, 6d is the double-effect upper non-condensable gas outlet, 6e is the double-effect lower non-condensable gas outlet, and 6f is the double-effect condensate outlet; 7. the system comprises a triple-effect heater, a triple-effect heating inlet, a triple-effect heating outlet, a triple-effect steam inlet, a triple-effect upper non-condensable gas outlet, a triple-effect lower non-condensable gas outlet, a triple-effect condensate water inlet and a triple-effect steam outlet, wherein 7a, 7b, 7c, 7d, 7e, 7f and 7g are respectively arranged on the upper surface of the triple-effect upper non-condensable gas outlet and the lower surface of the triple-effect lower non-condensable gas outlet; 8. the system comprises a four-effect heater, a four-effect heating inlet, a four-effect heating outlet, a four-effect steam inlet, a four-effect upper non-condensable gas outlet, a four-effect lower non-condensable gas outlet, a four-effect condensate water inlet and a four-effect balance port, wherein the four-effect heater is 8a, the four-effect heating inlet is 8b, the four-effect steam inlet is 8c, the four-effect upper non-condensable gas outlet is 8d, the four-effect lower non-condensable gas outlet is 8e, the four-effect condensate water outlet is 8f, the four-effect condensate water inlet is 8g, and the four-effect balance port is 8 h; 9. a feed pump; 10. a one-effect circulation pump; 11. a effect transfer pump; 12. a two-effect circulating pump; 13. a two-effect material transfer pump; 14. a three-effect circulating pump; 15. a three-effect material transferring pump; 16. a four-effect circulating pump; 17. a four-effect discharge pump; 18. a thickener, 18a. a thick inlet, 18b. a clear liquid overflow port, and 18c. a deposition outlet; 19. centrifuge, 19a centrifugal inlet, 19b centrifugal solids outlet, 19c centrifugal liquid outlet; 20. a mother liquor tank 20a. a mother liquor outlet; 21. a mother liquor pump; 22. four-effect salt legs; 23. a hot water tank, 23a hot water inlet, 23b hot water balance port, and 23c hot water outlet; 24. a hot water pump; 25. a hot water preheater; 26. a first condensate tank, 26a first condensate inlet, 26b a first condensate outlet, 26c a first condensate balance port; 27. a first condensate pump; 28. a condensate water preheater; 29. a condenser, 29a, a condensed gas inlet, 29b, a condensed water outlet, 29c, a condensed gas outlet, 29d, a circulating cold water inlet and 29e, a circulating cold water outlet; 30. a second condensate tank 30a, a second condensate inlet, 30b, a second condensate outlet, and 30c, a second air outlet; 31. a second condensate pump; 32. a vacuum pump.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1-7, the sodium sulfate four-effect evaporative crystallization apparatus of the present invention includes a first-effect separator 1, a second-effect separator 2, a third-effect separator 3, a fourth-effect separator 4, a first-effect heater 5, a second-effect heater 6, a third-effect heater 7, and a fourth-effect heater 8;

wherein, the side wall of the first-effect separator 1 is provided with a first-effect separation inlet 1a and a first-effect separation outlet 1b, and the top is provided with a first-effect secondary steam outlet 1 c; a secondary effect separation inlet 2a and a secondary effect separation outlet 2b are arranged on the side wall of the secondary effect separator 2, and a secondary effect secondary steam outlet 2c is arranged at the top; the side wall of the three-effect separator 3 is provided with a three-effect separation inlet 3a and a three-effect separation outlet 3b, and the top of the three-effect separator is provided with a three-effect secondary steam outlet 3 c; the side wall of the four-effect separator 4 is provided with a four-effect separation inlet 4a and a four-effect separation outlet 4b, the top is provided with a four-effect secondary steam outlet 4c, the bottom is provided with a four-effect salt leg 22, and the four-effect separator 4 is an OLSO crystallizer.

The bottom of the first-effect heater 5 is provided with a first-effect heating inlet 5a, the top of the first-effect heater is provided with a first-effect heating outlet 5b, and the side wall of the first-effect heater is provided with a first-effect steam inlet 5c, a first-effect upper non-condensable gas outlet 5d, a first-effect lower non-condensable gas outlet 5e, a first-effect hot water outlet 5f and a first-effect balance port 5 g; the bottom of the double-effect heater 6 is provided with a double-effect heating inlet 6a, the top is provided with a double-effect heating outlet 6b, and the side wall is provided with a double-effect steam inlet 6c, a double-effect upper non-condensable gas outlet 6d, a double-effect lower non-condensable gas outlet 6e and a double-effect condensed water outlet 6 f; the bottom of the triple-effect heater 7 is provided with a triple-effect heating inlet 7a, the top of the triple-effect heater 7 is provided with a triple-effect heating outlet 7b, the side wall of the triple-effect heater is provided with a triple-effect steam inlet 7c, a triple-effect upper non-condensable gas outlet 7d, a triple-effect lower non-condensable gas outlet 7e, a triple-effect condensed water outlet 7f and a triple-effect condensed water inlet 7g, the bottom of the four-effect heater 8 is provided with a four-effect heating inlet 8a, the top of the four-effect heater is provided with a four-effect heating outlet 8b, and the side wall of the four-effect heater is provided with a four-effect steam inlet 8c, a four-effect upper non-condensable gas outlet 8d, a four-effect lower non-condensable gas outlet 8e, a four-effect condensed water outlet 8f, a four-effect condensed water inlet 8g and a four-effect balance port 8h.

As shown in fig. 2, the first-effect separation outlet 1b is communicated with the first-effect heating inlet 5a through a first-effect circulating pump 10 and is communicated with the second-effect separation inlet 2a of the second-effect separator 2 through a first-effect material transferring pump 11, the first-effect heating outlet 5b of the first-effect heater 5 is communicated with the first-effect separation inlet 1a, the input end of the first-effect circulating pump 10 is connected with a feeding pump 9, the second-effect separation outlet 2b is communicated with the second-effect heating inlet 6a through a second-effect circulating pump 12 and is communicated with the third-effect separation inlet 3a through a second-effect material transferring pump 13, and the second-effect heating outlet 6b of the second-effect heater 6 is communicated with the second-effect separation inlet 2 a; the three-effect separation outlet 3b is communicated with the three-effect heating inlet 7a through a three-effect circulating pump 14 and is communicated with the four-effect separation inlet 4a of the four-effect separator 4 through a three-effect material transferring pump 15, and the three-effect heating outlet 7b of the three-effect heater 7 is communicated with the three-effect separation inlet 3 a; the four-effect separation outlet 4b is communicated with the four-effect separation heating inlet 4a through a four-effect circulating pump 16, the four-effect salt leg 22 is communicated with the solid-liquid separation device through a four-effect discharge pump 17, and the four-effect heating outlet 8b is communicated with the four-effect separation inlet 4a.

When the sodium sulfate four-effect evaporative crystallization device operates, the feeding pump 9 is started, a material solution containing sodium sulfate is conveyed to the input end of the one-effect circulating pump 10, the material is conveyed into the one-effect heater 5 through the one-effect heating inlet 5a under the pushing action of the one-effect circulating pump 10, the temperature is increased after the heat exchange with steam in the one-effect heater 5, the material enters the one-effect heater 1 through the one-effect separation inlet 1a after being discharged from the one-effect heating outlet 5b, and then the material is discharged from the one-effect separation outlet 5b and enters the one-effect heater 5 again under the pushing action of the one-effect circulating pump 10. Therefore, the materials circularly flow between the first-effect separator 1 and the first-effect heater 5 and are heated to raise the temperature, the materials with the raised temperature are boiled in the first-effect separator 1, water is evaporated to suck out crystals, and the concentration is raised.

After the material concentration in the first-effect separator 1 rises to a certain degree, the first-effect material-transferring pump 11 is started, the material is conveyed into the second-effect heater 6 through the second-effect heating inlet 6a, the material exchanges heat with steam in the second-effect heater 6 in the flowing process, so that the temperature rises, the material is discharged from the second-effect separation outlet 6b, the material enters the second-effect separator 2 through the second-effect separation inlet 2a, and then the material is discharged through the second-effect separation outlet 2b, and the material enters the second-effect heater 6 through the second-effect heating inlet 6a under the pushing action of the second-effect circulating pump 12 to exchange heat and rise in temperature. Therefore, the materials circularly flow between the two-effect separator 2 and the two-effect heater 6 and are heated to raise the temperature, the materials with the raised temperature continue to boil in the two-effect separator 2, the water is evaporated, and crystals are separated out after the concentration is raised.

After the material in the two-effect separator 2 is concentrated to a certain degree, the two-effect material transferring pump 13 is started, the material is conveyed into the three-effect heater 7 through the three-effect heating inlet 7a to exchange heat with steam, the heated material is discharged from the three-effect heating outlet 7b, then enters the three-effect separator 3 through the three-effect separation inlet 3a, and is discharged from the three-effect separation outlet 3b, and under the pushing of the three-effect circulating pump 14, the material enters the three-effect heater 7 through the three-effect heating inlet 7a again. Therefore, the materials circularly flow between the three-effect separator 3 and the three-effect heater 7, the temperature is increased, the materials with the increased temperature are boiled in the three-effect separator 3, the water is evaporated, and crystal particles are separated out after the concentration is increased.

After the material in the triple effect separator 3 is concentrated to a certain degree, triple effect commentaries on classics material pump 15 starts, carries material solution to the heat transfer with steam in the quadruple effect heater 8 through quadruple effect heating import 8a for the solution temperature risees, discharges the back via quadruple effect heating export 8b, in getting into quadruple effect separator 4 through quadruple effect separation import 4a, and then the material is discharged from quadruple effect separation export 4b, under the promotion of quadruple effect circulating pump 16, in getting into quadruple effect heater from quadruple effect heating import 8a. Thus, the materials circularly flow between the four-effect separator 4 and the four-effect heater 8, the temperature is raised, and finally the materials with raised temperature are boiled in the four-effect separator 4, the concentration is further raised, crystals are separated out and are settled in the four-effect salt leg 22; then the four-effect discharge pump 17 is started to convey the materials to a solid-liquid separation device for solid-liquid separation treatment.

As shown in fig. 3, the solid-liquid separation apparatus includes a thickener 18 and a centrifuge 19; the top, the side wall and the bottom of the thickener 18 are respectively provided with a thickener inlet 18a, a clear liquid overflow port 18b and a sedimentation outlet 18 c; the top, the side wall and the bottom of the centrifuge 19 are respectively provided with a centrifugal inlet 19a, a centrifugal liquid outlet 19c and a centrifugal solid outlet 19 b; wherein, the thick inlet 18a is communicated with the output end of the four-effect discharge pump 17, the deposition outlet 18c is communicated with the centrifugal inlet 19a, and the core liquid outlet 19c is communicated with the mother liquid tank 20; the liquid tank 20 is provided with a mother liquid outlet 20a, and the mother liquid outlet 20a is communicated with a four-effect salt leg 22 through a mother liquid pump 21

The four-effect discharge pump 17 conveys the liquid into the thickener 18 for thickening, the clear liquid is discharged from the clear liquid overflow port 18b and enters the mother liquid tank 20, and the crystal slurry is settled at the bottom in the thickener 18 and is discharged from the deposition outlet 18c and then enters the centrifuge 19 for centrifugal treatment. The solids obtained by centrifugation are discharged out of the system from a centrifugal solids outlet 19b, and the liquid is discharged from a centrifugal liquid outlet 19a and enters a mother liquor tank 20; the mother liquor pump 21 is started to draw the solution from the mother liquor port 20a and convey the solution to the four-effect salt leg 22 to continue the evaporative crystallization treatment, so as to improve the evaporative crystallization effect.

As shown in fig. 4, the sodium sulfate four-effect evaporation crystallization device of the present invention further comprises a hot water tank 23, wherein the top, the side wall and the bottom of the hot water tank 23 are respectively provided with a hot water balance port 23b, a hot water inlet 23a and a hot water outlet 23 c; wherein, the first-effect hot water outlet 5f is communicated with the hot water inlet 23a, and the hot water balance port 23b is communicated with the first-effect balance port 5 g; the hot water outlet 23c is communicated with a hot water pump 24; still include hot water preheater 25, hot water preheater 25's heat medium import and the output intercommunication of hot-water pump 24, heat medium export and external intercommunication, the feed inlet communicates with the output of charge pump 9, the discharge gate communicates with the input of an effect circulating pump 10.

As shown in fig. 5, the four-effect condensed water outlet 8f is communicated with a first condensed water tank 26, and the top, the side wall and the bottom of the first condensed water tank 26 are respectively provided with a first condensed balance port 26c, a first condensed water inlet 26a and a first condensed water outlet 26 b; the first condensed water inlet 26a is communicated with the four-effect condensed water outlet 8f, the first condensation balance port 26c is communicated with the four-effect balance port 8h, and the first condensed water outlet 26b is communicated with a first condensed water pump 27; a condensed water preheater 28 is arranged between the first condensed water pump 27 and the feed pump 9, a feed inlet of the condensed water preheater 28 is communicated with an output end of the feed pump 9, a discharge outlet of the condensed water preheater 28 is communicated with a feed inlet of the hot water preheater 25, a heat medium inlet is communicated with an output end of the first condensed water pump 27, and a heat medium outlet is communicated with the outside.

As shown in fig. 6 and 7, the first-effect steam inlet 5c is used for communicating with a raw steam source, the first-effect upper non-condensable gas outlet 5d, the first-effect lower non-condensable gas outlet 5e and the first-effect secondary steam inlet 10c are all communicated with the second-effect steam inlet 6c, the second-effect upper non-condensable gas outlet 6d, the second-effect lower non-condensable gas outlet 6e and the second-effect secondary steam outlet 2c are all communicated with the third-effect steam inlet 7c, and the third-effect upper non-condensable gas outlet 7d, the third-effect lower non-condensable gas outlet 7e and the third-effect secondary steam outlet 3c are all communicated with the fourth-effect steam inlet 8 c; the two-effect condensed water outlet 6f is communicated with the three-effect condensed water inlet 7g, and the three-effect condensed water outlet 7f is communicated with the four-effect condensed water inlet 8g.

The sodium sulfate four-effect evaporation crystallization device also comprises a condenser 29 and a second condensed water tank 30; the top of the condenser 29 is provided with a circulating cold water inlet 29d and a circulating cold water outlet 29e, the side wall is provided with a condensed gas inlet 29a, a condensed water outlet 29b and a condensed gas outlet 29c, the top of the second condensed water tank 30 is provided with a second gas outlet 30c, the side wall is provided with a second condensed water inlet 30a, and the bottom of the second condensed water tank is provided with a second condensed water outlet 30b. The four-effect upper non-condensable gas outlet 8d, the four-effect lower non-condensable gas outlet 8e and the four-effect secondary steam outlet 4c are communicated with a condensed gas inlet 29 a; the condensate outlet 29b is communicated with a second condensate inlet 30b, the second condensate outlet 30b is communicated with the outside through a second condensate pump 31, and the second air outlet 30c and the condensate air outlet 29 are both communicated with the outside through a vacuum pump 32.

In the evaporation crystallization process of the device, a raw steam source provides high-temperature raw steam, the raw steam enters the 5 shell passes of the primary heater from the 5c shell passes of the primary heater, the 5 shell passes of the primary heater exchange heat with materials of the tube passes, the raw steam is condensed into hot water, and then the hot water is discharged from the 5f primary hot water outlet and enters the hot water tank 23 through the 23a hot water inlet. The hot water in the hot water tank 23 is discharged through the hot water discharge port 23c, enters the hot water pump 24, and enters the hot water preheater 25 by being pushed by the hot water pump 24. In the hot water preheater 25, hot water is discharged from the system after heat exchange between the hot water and the material. The hot water balance port 23b is communicated with the one-effect balance port 5g, which can ensure that hot water generated by the one-effect heater 5 can smoothly flow into the hot water tank 25.

The non-condensable gas in the first-effect heater 5 is discharged from a first-effect upper non-condensable gas outlet 5d and a first-effect lower non-condensable gas outlet 5e, and enters a shell pass of the second-effect heater 6 through a second-effect steam inlet 6 c; meanwhile, when the first-effect separator 1 operates, secondary steam generated after evaporation and concentration of materials is discharged from the first-effect secondary steam outlet 1c and enters the shell pass of the second-effect heater 6 through the second-effect steam inlet 6c. The steam exchanges heat with the materials on the tube pass in the shell pass of the double-effect heater 6, after the steam is condensed into hot water, the hot water is discharged from a double-effect condensed water outlet 6f, enters the shell pass of the triple-effect heater 7 through a triple-effect condensed water inlet 7g and is flashed; the non-condensable gas of the double-effect heater 6 is discharged from a non-condensable gas outlet 6d on the double effect and a non-condensable gas outlet 6e under the double effect, meanwhile, the materials in the double-effect separator 2 are concentrated, the secondary steam generated by evaporation is discharged through a secondary steam outlet 2c, and the steam enters the shell pass of the triple-effect heater 7 through a triple-effect steam inlet 7c.

Steam exchanges heat with materials on the tube pass in the shell pass of the triple-effect heater 7, secondary steam generated by the double effects is condensed into hot water, the hot water is discharged from a triple-effect condensate outlet 7f, enters the shell pass of the four-effect heater 8 through a four-effect condensate inlet 7g and is flashed; the non-condensable gas in the triple-effect heater 7 is discharged from a triple-effect upper non-condensable gas outlet 7d and a triple-effect lower non-condensable gas outlet 7e, meanwhile, the materials are boiled and evaporated in the triple-effect separator 3, the generated secondary steam is discharged from a triple-effect secondary steam outlet 3c, and the non-condensable gas and the secondary steam enter the shell pass of the four-effect heater 4 through a four-effect steam inlet 8c.

The secondary steam exchanges heat with the material of the tube pass at the shell pass of the four-effect heater 4, and after being condensed into hot water, the secondary steam is discharged from the four-effect condensed water outlet 8f and enters the first condensed water tank 26 through the first condensed water inlet 26a. The non-condensable gas of the four-effect heater 8 is discharged through a four-effect upper non-condensable gas outlet 8d and a four-effect lower non-condensable gas outlet 8e, the materials are boiled and evaporated in the four-effect separator 4, the generated secondary steam is discharged from a four-effect secondary steam outlet 4c, and the non-condensable gas and the secondary steam enter a shell pass of the condenser 29 through a condensed gas inlet 29a.

The secondary steam is condensed into water through heat exchange with the circulating cooling water of the tube pass at the shell pass of the condenser 29, and the condensed water is discharged from the condensed water outlet 29b and then enters the second condensed water tank 30 through the second condensed water inlet 30a. The gas discharged from the second gas outlet 30c of the second condensed water tank 30 is combined with the gas discharged from the condensed gas outlet 29c, and then discharged out of the system by the vacuum pump 32.

The condensed water in the first condensed water tank 26 is discharged from the first condensed water outlet 26b, and under the driving of the first condensed water pump 27, the condensed water enters the condensed water preheater 28, and after heat exchange with the material output by the feed pump 9 is carried out in the condensed water preheater 28, the condensed water is discharged out of the system. The first condensation balance port 26c is communicated with the four-effect balance port 8h, so that the condensed water generated by the four-effect heater 8 can smoothly flow into the first condensed water tank 26.

When the sodium sulfate four-effect evaporative crystallization device runs, raw material liquid is sent into the sodium sulfate four-effect evaporative crystallization device, a first-effect circulating pump 10, a second-effect circulating pump 12, a third-effect circulating pump 14 and a fourth-effect circulating pump 16 are started, a vacuum pump 32 is started, circulating cooling water of a condenser 29 is started, and raw steam is started to heat materials in a first-effect heater 5; the first-effect material boils in the first-effect separator 1 to generate secondary steam, the secondary steam is supplied to the second-effect heater 6 for heating, the second-effect material boils in the second-effect separator 2 to generate secondary steam, the third-effect heater 7 for heating, the third-effect material boils in the third-effect separator 3 to generate secondary steam, the fourth-effect heater 8 for heating, the fourth-effect material boils in the fourth-effect separator 4 to generate secondary steam, the secondary steam is conveyed to the condenser 29, and the secondary steam exchanges heat with circulating cooling water in the condenser 29 to be condensed into water. The material is conveyed to a double-effect heater 6 through a single-effect material transfer pump 11 after being subjected to single-effect evaporation concentration, conveyed to a triple-effect heater 7 after being subjected to double-effect evaporation concentration, conveyed to a four-effect heater 8 after being subjected to triple-effect evaporation concentration, conveyed to a thickener 18 through a four-effect discharge pump 17 after being subjected to four-effect evaporation concentration, centrifugally separated by a centrifuge 19, discharged from a centrifugal solid discharge system, and returned to a four-effect separator 4 through a mother liquor pump 21 to be continuously evaporated and crystallized.

In conclusion, the evaporative crystallization device provided by the utility model adopts four-effect downstream forced circulation evaporative crystallization of anhydrous sodium sulfate, and compared with the prior art, the evaporative crystallization device has the following advantages:

1. in order to prevent the pipe blockage caused by the change of the feeding concentration, the device adopts forced circulation evaporation crystallization, and can adapt to evaporation crystallization of sodium sulfate with various concentrations [ other processes firstly adopt a membrane evaporator (falling film or rising film or plate type) for evaporation concentration, then adopt forced circulation evaporation crystallization, and when the feeding concentration of the material is increased, the pipe blockage is caused by crystallization in the membrane evaporator;

2. the four-effect evaporation is adopted, so that the steam consumption is further reduced, and the effect of saving energy consumption is achieved;

3. through the arrangement of the hot water tank 23, the first condensate water tank 26 and the second condensate water tank 30, the heat of condensate water is better utilized, and the consumption of circulating cooling water is reduced (in other process equipment, the condensate water of the shell pass of the four-effect heater flows to the condensate water tank to be mixed with the condensate water in the condenser, because the pressure in the condensate water tank is lower than that of the shell pass of the four-effect heater, the condensate water of the shell pass of the four-effect heater can be flashed after entering the condensate water tank, and the flashed steam is condensed in the condenser, so that the temperature of the condensate water in the condensate water tank is reduced, the load of the condenser is increased, and the consumption of the circulating cooling water is increased);

4. the fourth effect separator 4 adopts an OSLO crystallizer form, so that the crystal retention time is prolonged, and the serious material running of the centrifugal machine 19 caused by undersize sodium sulfate crystal particles is effectively prevented.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A sodium sulfate quadruple-effect evaporation crystallization device is characterized in that:

comprises a first-effect separator (1), a second-effect separator (2), a third-effect separator (3), a fourth-effect separator (4), a first-effect heater (5), a second-effect heater (6), a third-effect heater (7) and a fourth-effect heater (8);

the primary-effect separation outlet (1 b) of the primary-effect separator (1) is communicated with the primary-effect heating inlet (5 a) of the primary-effect heater (5) through a primary-effect circulating pump (10) and is communicated with the secondary-effect separation inlet (2 a) of the secondary-effect separator (2) through a primary-effect material transferring pump (11), and the primary-effect heating outlet (5 b) of the primary-effect heater (5) is communicated with the primary-effect separation inlet (1 a) of the primary-effect separator (1); the input end of the single-effect circulating pump (10) is connected with a feed pump (9);

a secondary-effect separation outlet (2 b) of the secondary-effect separator (2) is communicated with a secondary-effect heating inlet (6 a) of the secondary-effect heater (6) through a secondary-effect circulating pump (12) and is communicated with a tertiary-effect separation inlet (3 a) of the tertiary-effect separator (3) through a secondary-effect material transferring pump (13), and a secondary-effect heating outlet (6 b) of the secondary-effect heater (6) is communicated with the secondary-effect separation inlet (2 a);

a triple-effect separation outlet (3 b) of the triple-effect separator (3) is communicated with a triple-effect heating inlet (7 a) of the triple-effect heater (7) through a triple-effect circulating pump (14) and is communicated with a four-effect separation inlet (4 a) of the four-effect separator (4) through a triple-effect material transferring pump (15), and a triple-effect heating outlet (7 b) of the triple-effect heater (7) is communicated with the triple-effect separation inlet (3 a);

the bottom of four-effect separator (4) is provided with four-effect salt leg (22), four-effect separation export (4 b) of four-effect separator (4) through four-effect circulating pump (16) with four-effect heating import (8 a) intercommunication of four-effect heater (8), four-effect salt leg (22) through four-effect discharge pump (17) and solid-liquid separation device intercommunication, four-effect heating export (8 b) of four-effect heater (8) with four-effect separation import (4 a) intercommunication.

2. The sodium sulfate quadruple effect evaporative crystallization device according to claim 1, wherein: the solid-liquid separation device comprises a thickener (18) and a centrifuge (19), a thick inlet (18 a) of the thickener (18) is communicated with the output end of the four-effect discharge pump (17), a clear liquid overflow port (18 b) is communicated with a mother liquor tank (20), a deposition outlet (18 c) is communicated with a centrifugal inlet (19 a) of the centrifuge (19), a centrifugal solid outlet (19 b) of the centrifuge (19) is communicated with the outside, and a centrifugal liquid outlet (19 c) is communicated with the mother liquor tank (20); the mother liquor tank (20) is provided with a mother liquor outlet (20 a), and the mother liquor outlet (20 a) is communicated with the four-effect salt leg (22) through a mother liquor pump (21).

3. The sodium sulfate quadruple effect evaporative crystallization device according to claim 1, wherein: the single-effect heater (5) is provided with a single-effect hot water outlet (5 f) and a single-effect balance opening (5 g), the single-effect hot water outlet (5 f) is communicated with a hot water tank (23), the hot water tank (23) is provided with a hot water balance opening (23 b), and the hot water balance opening (23 b) is communicated with the single-effect balance opening (5 g).

4. The sodium sulfate quadruple effect evaporative crystallization device according to claim 3, wherein: a hot water outlet (23 c) is formed in the hot water tank (23), and the hot water outlet (23 c) is communicated with a hot water pump (24); still include hot water preheater (25), the heat medium import of hot water preheater (25) with the output intercommunication of hot water pump (24), heat medium export and external intercommunication, the feed inlet with the output intercommunication of charge pump (9), the discharge gate with the input intercommunication of an effect circulating pump (10).

5. The sodium sulfate quadruple effect evaporative crystallization device of claim 4, wherein: a secondary-effect condensed water outlet (6 f) is formed in the secondary-effect heater (6), a tertiary-effect condensed water inlet (7 g) and a tertiary-effect condensed water outlet (7 f) are formed in the tertiary-effect heater (7), and a quaternary-effect condensed water inlet (8 g), a quaternary-effect condensed water outlet (8 f) and a quaternary-effect balance port (8 h) are formed in the quaternary-effect heater (8); the two-effect condensate outlet (6 f) is communicated with the three-effect condensate inlet (7 g), the three-effect condensate outlet (7 f) is communicated with the four-effect condensate inlet (8 g), the four-effect condensate outlet (8 f) is communicated with a first condensate tank (26), a first condensation balance port (26 c) is formed in the first condensate tank (26), and the first condensation balance port (26 c) is communicated with the four-effect balance port (8 h).

6. The sodium sulfate quadruple effect evaporative crystallization device of claim 5, wherein: a first condensed water outlet (26 b) is formed in the first condensed water tank (26), and a first condensed water pump (27) is communicated with the first condensed water outlet (26 b); first condensate pump (27) with be provided with comdenstion water preheater (28) between charge pump (9), the feed inlet of comdenstion water preheater (28) with the output intercommunication of charge pump (9), the discharge gate with the feed inlet intercommunication of hot water preheater (25), heat medium import with the output intercommunication of first condensate pump (27), heat medium export and external intercommunication.

7. The sodium sulfate quadruple effect evaporative crystallization device according to claim 1, wherein: a primary-effect steam inlet (5 c) of the primary-effect heater (5) is communicated with a steam generation source, a primary-effect upper non-condensable gas outlet (5 d) and a primary-effect lower non-condensable gas outlet (5 e) are communicated with a secondary-effect steam inlet (6 c) of the secondary-effect heater (6), a secondary-effect upper non-condensable gas outlet (6 d) and a secondary-effect lower non-condensable gas outlet (6 e) of the secondary-effect heater (6) are communicated with a tertiary-effect steam inlet (7 c) of the tertiary-effect heater (7), and a tertiary-effect upper non-condensable gas outlet (7 d) and a tertiary-effect lower non-condensable gas outlet (7 e) are communicated with a quaternary-effect steam inlet (8 c) of the quaternary-effect heater (8); still include condenser (29), the condensate gas import (29 a) of condenser (29) with on the four effects of four effects heater (8) noncondensable gas export (8 d) and four effects noncondensable gas export (8 e) intercommunication down, the condensation delivery port (29 b) intercommunication of condenser (29) has second condensate water pitcher (30), be provided with second condensate water export (30 b) on second condensate water pitcher (30), second condensate water export (30 b) are through second condensate water pump (31) and external intercommunication.

8. The sodium sulfate quadruple effect evaporative crystallization device of claim 7, wherein: and a second air outlet (30 c) is formed in the second condensed water tank (30), a condensed air outlet (29 c) is formed in the condenser (29), and the second air outlet (30 c) and the condensed air outlet (29 c) are communicated with the outside through a vacuum pump (32).

9. The sodium sulfate quadruple effect evaporative crystallization device of claim 7, wherein: the device comprises a primary-effect secondary steam outlet (1 c) of a primary-effect separator (1) and a secondary-effect steam inlet (6 c) of a secondary-effect heater (6) which are communicated, a secondary-effect secondary steam outlet (2 c) of a secondary-effect separator (2) and a tertiary-effect steam inlet (7 c) of a tertiary-effect heater (7) which are communicated, a tertiary-effect secondary steam outlet (3 c) of a tertiary-effect separator (3) and a quaternary-effect steam inlet (8 c) of a quaternary-effect heater (8) which are communicated, and a quaternary-effect secondary steam outlet (4 c) of a quaternary-effect separator (4) and a condensed gas inlet (29 a) of a condenser (29) which are communicated.

10. The sodium sulfate quadruple effect evaporative crystallization device according to claim 2, characterized in that: the four-effect separator (4) is an OSLO crystallizer.

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