Sodium sulfate crystallization device

Abstract

The utility model discloses a sodium sulfate crystallization device which comprises a thickening kettle used for receiving sodium sulfate crystal slurry and a plurality of weighing modules arranged on a platform or a supporting frame, a plurality of weighing lugs are arranged on the outer side wall of the thickening kettle, and each weighing lug is matched with each weighing module. A plurality of weighing modules are arranged on a chemical platform or a supporting frame, then weighing lugs matched with the weighing modules are arranged on the outer side wall of a thickening kettle, specifically, each weighing lug is matched with the corresponding weighing module, the thickening kettle and materials in the thickening kettle are weighed through the weighing modules, and the weighing modules are arranged on the outer side wall of the thickening kettle. According to the numerical value change on the display screen matched with the weighing module, the overall weight change of the thickening kettle is judged, so that when materials in the thickening kettle enter a subsequent process, namely the time for the materials to enter a centrifugal machine, the mode of manual observation or according to experience is avoided, the process is simple and uniform, and operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, concretely relates to a sodium sulfate crystallization device. BACKGROUND

[0002] MVR is the abbreviation of mechanical vapor recompression. Its process is to reuse the energy of secondary steam generated by itself, thereby reducing the demand for external energy, which is an energy-saving technology widely used in the separation of solution and solute in the field of water treatment, which is composed of forced circulation pump, crystallizer, thickening kettle and centrifuge.

[0003] At present, in the application of MVR for separating sodium sulfate wastewater, the crystallizer is communicated with the forced circulation pump and the thickening kettle, which is used for evaporative crystallization of the wastewater circulating in the crystallizer generated by the forced circulation pump, and the crystallized wastewater is gravity settled into the salt foot structure or the settling chamber, thereby forming a high-salt-content salt-containing mother liquor, which flows to the thickening kettle through the salt foot outlet of the salt foot structure or the crystal slurry outlet of the settling chamber, and then flows to the centrifuge for centrifugation.

[0004] However, the thickening crystal slurry in the thickening kettle needs to be observed manually or according to experience, and the thickening crystal slurry is sent into the centrifuge, but this manual observation or experience-based method is time-consuming and laborious, therefore, how to solve this problem becomes a technical difficulty that technicians need to solve. UTILITY MODEL CONTENT

[0005] To solve the above technical problems, the utility model provides a sodium sulfate crystallization device, which comprises a thickening kettle for receiving sodium sulfate crystal slurry and a plurality of weighing modules arranged on a platform or a support frame, a plurality of weighing ears are arranged on the outer side wall of the thickening kettle, and each weighing ear is matched with each weighing module. By arranging a plurality of weighing modules on the chemical platform or the support frame, and then arranging weighing ears matched with the weighing modules on the outer side wall of the thickening kettle, specifically, each weighing ear is matched with each weighing module, the weighing module is used to weigh the thickening kettle and the materials therein, and then the weight change of the whole thickening kettle is judged according to the numerical change on the display screen matched with the weighing module, so as to determine when the materials in the thickening kettle enter the subsequent process, i.e. the time when they enter the centrifuge, avoiding manual observation or experience-based method, making the process simple and uniform, and facilitating operation. Further, the above operation can be modularized, i.e. controlled by a controller or a single-chip microcomputer, realizing automatic operation.

[0006] In an embodiment, a crystallizer without salt foot structure and a forced circulation heat exchanger are included; the lowermost end of the crystallizer is a material outlet, a material inlet is arranged on the sidewall above the material outlet, the forced circulation heat exchanger is provided with a circulating material inlet and a circulating material outlet, the circulating material inlet is communicated with the material outlet through a pipeline, the circulating material outlet is communicated with the material inlet through a pipeline, and the pipeline between the circulating material inlet and the material outlet is further communicated with a raw material liquid pipeline; the pipeline between the circulating material inlet and the material outlet is further connected with a thickening kettle through a discharge pipeline and a discharge pump. By arranging the crystallizer without salt foot structure and the forced circulation heat exchanger, the material inlet and the material outlet are arranged on the crystallizer, the forced circulation heat exchanger is provided with the circulating material inlet and the circulating material outlet, and the four are connected through pipelines to form a circulation. The material (sodium sulfate solution) heated by the forced circulation heat exchanger enters the crystallizer for evaporation, and then the crystallized sodium sulfate crystals continue to exist in the material (sodium sulfate solution) and move in a circulation. Meanwhile, the salt foot structure is removed, the solution containing sodium sulfate crystals is directly guided into the thickening kettle through the discharge pipeline and the discharge pump for operation, the equipment and operation are simplified, and the problem of blockage caused by the sodium sulfate crystals settling and adhering to the salt foot outlet and the pipeline in the prior art is avoided.

[0007] In an embodiment, a forced circulation pump is arranged on the pipeline between the material outlet and the circulating material inlet. By arranging the forced circulation pump on the circulation pipeline, the circulation between the crystallizer and the forced circulation heat exchanger is further guaranteed.

[0008] In an embodiment, the pipeline between the circulating material inlet and the material outlet at least includes a vertical or inclined discharge pipe directly connected with the material outlet. By arranging the material outlet at the bottom of the crystallizer, the interfaces and bends are reduced, and by arranging the vertical or inclined discharge pipe, the material containing sodium sulfate crystals in the crystallizer falls quickly, the probability of sodium sulfate crystals adhering to the pipe wall is further reduced, and the circulation of the material is guaranteed.

[0009] In an embodiment, the thickening kettle is further connected with a centrifugal machine. By arranging the centrifugal machine, the thick crystal slurry in the thickening kettle is further treated and dewatered to obtain sodium sulfate crystals

[0010] Further, the clear liquid outlet of the thickening kettle and the centrifugal liquid outlet of the centrifugal machine are communicated with a mother liquor tank through pipelines. By arranging the mother liquor tank, the clear liquid of the thickening kettle and the centrifugal liquid of the centrifugal machine can be stored.

[0011] Further, the mother liquor tank is also communicated with the pipeline between the circulating material inlet and the material outlet through a mother liquor pump and a pipeline. By setting the mother liquor pump and the corresponding pipeline, the mixed liquid of the supernatant of the thick cauldron in the mother liquor tank and the centrifugal liquid of the centrifugal machine is added to the material circulation between the crystallizer and the forced circulation heat exchanger, which further heats the evaporative crystallization sodium sulfate crystals, reduces the discharge of waste water, and improves the yield of sodium sulfate crystals. At the same time, by adding the supernatant and the centrifugal liquid, the pipeline can be cleaned in the material lifting stage, and the attachment of crystals on the pipe wall is reduced.

[0012] In an embodiment, the steam outlet of the crystallization separator is communicated with a steam mechanical compressor through a secondary steam pipeline; the secondary steam pipeline comprises a horizontal inlet pipe before the secondary steam inlet of the steam mechanical compressor, an inlet pipe higher than the horizontal inlet pipe and connected to the other end of the horizontal inlet pipe, and a remaining pipeline; the inlet pipe is a vertical inlet pipe or an inclined inlet pipe; at the position where the horizontal inlet pipe and the inlet pipe are connected, the inlet pipe continues to extend axially below the horizontal inlet pipe to form a liquid accumulation tank or the inlet pipe is connected to a liquid accumulation tank through a connecting pipe arranged below the horizontal inlet pipe. By the above arrangement, the problem of effectively utilizing the energy of the secondary steam of the crystallization separator can be solved. Further, by changing the position and structure of the condensate water drainage port in the secondary steam pipeline, the condensate water in the secondary steam is greatly reduced, thereby reducing the impact of the condensate water on the blades of the steam mechanical compressor and ensuring the stability of the steam mechanical compressor. Specifically, by changing the position of the drainage port, the position of the drainage port on the lower pipe wall of the horizontal inlet pipe is moved to the end position of the horizontal drainage pipe. The principle is that the condensate water in the secondary steam directly falls into the extended part of the inlet pipe or the connecting pipe through gravity before the secondary steam in the inlet pipe enters the horizontal inlet pipe. At this time, the content of condensate water in the secondary steam entering the horizontal inlet pipe is greatly reduced. At the same time, there is basically no condensate water at the bottom of the horizontal inlet pipe, and since the length of the horizontal inlet pipe is generally set to be relatively short, there is even less condensate water formed at the bottom of the horizontal inlet pipe, reducing secondary carrying (specifically, the airflow blows the condensate water at the bottom of the horizontal inlet pipe, and then carries the condensate water into the steam mechanical compressor). Therefore, the condensate water in the secondary steam entering the steam mechanical compressor is greatly reduced, ensuring the stability of the operation. Specifically, there are two technical solutions, one is to set the inlet pipe extension to form a liquid accumulation tank, and the other is to connect a liquid accumulation tank through a connecting pipe, wherein the thickness of the part of the connecting pipe connecting the inlet pipe is close to or the same as the thickness of the inlet pipe.

[0013] In one embodiment, a liquid blocking net is arranged in the pipeline at the connection between the horizontal air inlet pipe and the air inlet pipe. By arranging the liquid blocking net, condensed water in the secondary steam can be adhered to the net and slowed down when passing through the liquid blocking net, so as to facilitate dripping.

[0014] In one embodiment, a liquid blocking structure is arranged in the pipeline of the air inlet pipe extension or in the connecting pipe. By arranging the liquid blocking structure, the secondary steam can be prevented from impacting the liquid that has dripped into the liquid accumulation tank, so as to prevent secondary carrying and affect the stable operation of the steam mechanical compressor.

[0015] Further, the liquid blocking structure is a net structure or a plate structure with openings. The condensed water can be dripped, and the liquid caused by impact can be blocked.

[0016] In one embodiment, the liquid blocking structure is a flared structure. The above functions are further achieved, so that the liquid caused by impact can be blocked and flow down along the side wall, and the effect is better.

[0017] In one embodiment, a liquid accumulation pump connected to the liquid accumulation tank is further included, and the liquid accumulation pump can pump away the water in the liquid accumulation tank. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed in the specific embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a structural schematic diagram of a sodium sulfate crystallization device of the present application;

[0020] Figure 2 is a structural schematic diagram of another sodium sulfate crystallization device of the present application;

[0021] Figure 3 is a schematic diagram of the discharge of condensed water in the prior art;

[0022] Figure 4 is Figure 2 is an enlarged structural schematic diagram of A in FIG.

[0023] Figure 5 is Figure 2 is an enlarged structural schematic diagram of A in FIG.

[0024] Figure 6 is Figure 2 is another enlarged structural schematic diagram of A in FIG.

[0025] The reference signs in the drawings are as follows: 1-steam mechanical compressor; 2-horizontal air inlet pipe; 3-drain pipe; 4-liquid accumulation tank; 5-liquid accumulation pump; 6-air inlet pipe; 7-connection pipe; 8-liquid blocking net; 9-liquid blocking structure; 10-crystallizer; 11-forced circulation heat exchanger; 12-material outlet; 13-material inlet; 14-circulating material inlet; 15-circulating material outlet; 16-raw material liquid pipe; 17-discharge pipe; 18-discharge pump; 19-thickening kettle; 20-forced circulation pump; 21-discharge pipe; 22-centrifuge; 23-clear liquid outlet; 24-centrifugal liquid outlet; 25-mother liquor tank; 26-mother liquor pump; 27-steam outlet; 28-weighing module; 29-weighing lug. DETAILED DESCRIPTION

[0026] The content of the present application will be described below in conjunction with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application all belong to the scope of protection of the present application.

[0027] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict. Embodiment 1

[0030] As Figure 1As shown, the embodiment discloses a sodium sulfate crystallization device, which comprises a crystallizer 10 without a salt foot structure or a settling chamber or a crystallization chamber and a forced circulation heat exchanger 11, and the absence of the salt foot structure or the settling chamber or the crystallization chamber is an improvement point of the design. Specifically, the above-mentioned structure is removed from the existing crystallization separator, and after the removal, the crystallizer 10 is formed. Of course, the crystallizer 10 can also be designed with reference to the above-mentioned structure. In this way, the port of the conical cylinder structure of the crystallization separator forms a material outlet 12 of the crystallizer 10. A material inlet 13 is arranged on the side wall above the material outlet 12. The forced circulation heat exchanger 11 is provided with a circulating material inlet 14, a circulating material outlet 15, a heat exchange medium inlet, and a heat exchange medium outlet. The heat exchange medium is generally steam. The circulating material inlet 14 is communicated with the material outlet 12 through a pipeline. The circulating material outlet 15 is communicated with the material inlet 13 through a pipeline, so that the crystallizer 10 and the forced circulation heat exchanger 11 form a circulating channel. The process is that the sodium sulfate solution material heated by the forced circulation heat exchanger 11 enters the crystallizer 10 for evaporation crystallization. The evaporated water vapor is discharged through the steam outlet 27 arranged at the top, and the crystals continue to circulate in the solution. The position of the sodium sulfate solution material entering the circulating channel is not limited. In the embodiment, the pipeline between the circulating material inlet 14 and the material outlet 13 is connected with a raw material liquid pipeline 16. The sodium sulfate solution material enters the circulating channel along the raw material liquid pipeline 16 for circulation. The pipeline between the circulating material inlet 14 and the material outlet 13 is also connected with a discharge pipeline 17 and a discharge pump 18 to connect a thickening kettle 19. In this way, the solution containing sodium sulfate crystals can enter the thickening kettle 19 through the discharge pipeline 17 for thickening, and then the thickened crystal slurry enters a centrifugal machine 22 for centrifugal treatment. Preferably, the inlet position of the discharge pipeline is located above the inlet position of the sodium sulfate solution material entering the circulating channel, so as to prevent the low-concentration solution not subjected to heating and crystallization from entering the thickening kettle 19. A plurality of weighing ears 29 are arranged on the outer side wall of the thickening kettle 19. Preferably, the plurality of weighing ears 29 are welded on the outer side wall of the thickening kettle 19 and are uniformly distributed in the circumferential direction. In the embodiment, there are four weighing ears. A plurality of weighing modules 28 are arranged on the platform or support frame (not shown in the figure) surrounding the thickening kettle 19. Each weighing module 28 corresponds to each weighing ear 29, so as to realize the weighing of the thickening kettle 19 by the weighing module 28. In the embodiment, there are four weighing modules 28. The display of the weighing value can be displayed on the display of the weighing module itself or can be collected in the controller of the overall control. The selection of the weighing module 19 is not limited, and a weighing sensor is preferably selected.Specifically, a through hole is arranged on the platform, a part of the thick kettle 19 is suspended below the platform, and a part is above the platform. The weighing module 28 is arranged on the platform outside the through hole, which not only supports the thick kettle 19, but also weighs the thick kettle 19. The fixing mode of the weighing module 28 on the platform or the support frame is not limited, and a fixing bolt is preferably used for fixing.

[0031] Further, a forced circulation pump 20 is arranged on the pipeline between the material outlet 12 and the circulating material inlet 13, which further ensures the circulation of the material in the circulation channel.

[0032] In an embodiment, the pipeline between the circulating material inlet 13 and the material outlet 12 at least includes a vertical or inclined discharge pipe 21 directly connected with the material outlet 12, that is, the material outlet 12 is directly connected with at least a vertical or inclined pipe body, which is named as the discharge pipe 21. The thickness of the discharge pipe 21 is generally a thick pipe body, such as an inner diameter of 40 cm or 50 cm, which is not limited. The length of the discharge pipe 21 is preferably about 3-10 m, and 10 m is the best.

[0033] Further, the clear liquid outlet 23 of the thick kettle 19 and the centrifugal liquid outlet 24 of the centrifugal machine 22 are connected with the mother liquor tank 25 through a pipeline, that is, the thick clear liquid and the centrifugal liquid are stored in the mother liquor tank 25.

[0034] Further, the mother liquor tank 25 is also connected with the pipeline between the circulating material inlet 14 and the material outlet 12 through a mother liquor pump 26 and a pipeline, that is, the liquid material stored in the mother liquor tank 25 is sent into the circulation channel through the mother liquor pump 26 for further heating, evaporation and crystallization. The connection position of the connection point is generally lower than the inlet position of the sodium sulfate solution material into the circulation channel.

[0035] It should be noted that various valves will be arranged on the above-mentioned pipeline for convenient control or maintenance, which will not be described here. Example 2

[0036] As Figure 2 and Figure 4As shown, this embodiment discloses a sodium sulfate crystallization device, which is a further design of Embodiment 1. The steam outlet 27 of the crystallizer 10 is connected to the steam mechanical compressor 1 through a secondary steam pipe. The secondary steam entering the steam mechanical compressor 1 is mechanically compressed and then enters the forced circulation heat exchanger 12 as a heat exchange medium through a pipe. The secondary steam pipe includes a horizontal inlet pipe 2 before the secondary steam inlet of the steam mechanical compressor 1, an inlet pipe 6 that is higher than the horizontal inlet pipe 2 and connected to the other end of the horizontal inlet pipe 2, and the remaining pipe. The horizontal inlet pipe 2 is the conventional inlet pipe of the steam mechanical compressor 1, and its length is determined according to the equipment design, but it is generally not too long, about 1m to 2m, but not limited to this range. The inlet pipe 6 is a vertical inlet pipe or an inclined inlet pipe, which refers to the setting angle of the inlet pipe, which can be determined according to the overall equipment design. A vertical structure is preferred, that is, a vertical inlet pipe. In this case, the droplets contained in the secondary steam are more likely to drip downwards due to gravity. At the connection between the horizontal intake pipe 2 and the intake pipe 6, the intake pipe 6 extends axially or extends below the horizontal intake pipe to form a liquid collection tank 4. The mechanism of this extension is not specifically limited, but preferably it is a single pipe. The horizontal intake pipe 2 is perpendicularly connected to this pipe or at an angle. Preferably, they are a three-way structure. The portion above the horizontal intake pipe 2 is the intake pipe 6, and the portion below the horizontal intake pipe 2 has its opening closed to form the liquid collection tank 4. To better illustrate this design, refer to the drainage design of the secondary steam pipeline before entering the steam mechanical compressor 1 in the prior art, such as... Figure 3 As shown, the bottom of the horizontal intake pipe is connected to the liquid collection tank 4 via a thinner drain pipe 3. Through comparison, this design changes two key aspects: firstly, it alters the outlet position of the condensate in the secondary steam; secondly, it addresses the problem in existing technologies where the thinner drain pipe 3 (typically 1 inch) results in slow drainage and water accumulation at the bottom of the horizontal intake pipe 2. In this design, the intake pipe 6 is typically selected with a diameter of 18 inches or 20 inches, but is not limited to these dimensions. By significantly reducing gas-liquid carryover, the impact of liquid on the compressor blades can be further reduced, improving stability. Example 3

[0037] like Figure 5 As shown, this embodiment discloses a sodium sulfate crystallization device, which is a further design based on embodiment 2. Specifically, a liquid blocking mesh 8 is provided in the pipe at the connection between the horizontal air inlet pipe 2 and the air inlet pipe 6. The specific location is not limited, as long as the secondary steam is at the location where it is to enter the horizontal air inlet pipe 2. The setting direction is not limited; it can be horizontal or vertical, depending on the setting location. Of course, it can also be inclined. In this embodiment, it is preferred to be inclined at 45 degrees. As for the aperture of the liquid blocking mesh 8, there is no specific limitation.

[0038] In one embodiment, a liquid-blocking structure 9 is provided inside the extended portion of the air intake pipe 6. The structure of the liquid-blocking structure 9 is not specifically limited; it can be a mesh or a plate with an opening for liquid to fall. Its shape is not limited. In this embodiment, the liquid-blocking structure 9 is a funnel-shaped structure.

[0039] In one embodiment, a sump pump 5 connected to the sump tank 4 is also included. The sump pump 5 is used to pump out the water in the sump tank 4 for other uses. As for the operation of the sump pump 9, a timer, a buoy limit start device, an observation window, etc. can be set, which will not be described in detail here.

[0040] Regarding secondary steam, after exiting the steam outlet, it can first pass through a demister for demisting before entering the steam mechanical compressor. Example 4

[0041] like Figure 6 As shown, this embodiment discloses a sodium sulfate crystallization device, which is a further modification of embodiment 2, specifically as follows: a liquid-blocking mesh 8 is provided in the pipe at the connection between the horizontal air inlet pipe 2 and the air inlet pipe 6. The specific position is not specifically limited, as long as the secondary steam is at the position where it is to enter the horizontal air inlet pipe 2. The setting direction is not specifically limited; it can be horizontal or vertical, depending on the setting position. Of course, it can also be inclined. In this embodiment, it is preferably set at a 45-degree inclination. As for the aperture of the liquid-blocking mesh 8, there is no specific limitation.

[0042] Furthermore, at the connection point between the horizontal air inlet pipe 2 and the air inlet pipe 6, the air inlet pipe 6 is connected to the liquid collection tank 4 via a connecting pipe 7 positioned lower than the horizontal air inlet pipe 2. Specifically, the air inlet pipe 6, the horizontal air inlet pipe 2, and the connecting pipe 7 form a three-way structure. The structure of the connecting pipe 7 is not specifically limited; it can be a regular-shaped pipe or an irregular-shaped pipe. In this embodiment, the connecting pipe 7 has a funnel-shaped structure. A liquid-blocking structure 9 is provided inside the connecting pipe 7. The structure of the liquid-blocking structure 9 is not specifically limited; it can be a mesh or a plate with an opening for liquid to fall. Its shape is not limited. In this embodiment, the liquid-blocking structure 9 has a funnel-shaped structure.

[0043] The usage process of this utility model is as follows:

[0044] The sodium sulfate solution enters the forced circulation heat exchanger 11 through the circulation material inlet 14 along the raw material liquid pipeline 16 to be heated and warmed, and then enters the crystallizer 10 through the circulation material outlet 15 along the pipeline to the material inlet 13 to perform the volatilization crystallization, in which process, the sodium sulfate crystals are formed in the solution, and the water vapor after volatilization is discharged from the steam outlet 27 as secondary steam; the mixed solution mixed with the sodium sulfate crystals enters the pipeline through the material outlet 12, part of which enters the forced circulation heat exchanger 12 along the pipeline to continue the circulation heating and warming and the volatilization crystallization, and part of which enters the thickening kettle 19 along the discharge pipeline 17 to be thickened; in the thickening process, since the specific gravity of the sodium sulfate crystals is greater than that of the sodium sulfate solution, as the thickening kettle 19 is continuously thickened and the sodium sulfate solution is continuously discharged, the sodium sulfate crystals in the thickening kettle 19 will be more and more, and the value of the weighing module 28 will be continuously increased; when the value reaches the designed value, the crystal slurry in the thickening kettle 19 enters the centrifugal machine 22 to be centrifuged, and the clear liquid after thickening and the centrifugal liquid after centrifugation enter the mother liquor tank 25 to be stored, and the above-mentioned solution can also enter the circulation channel through the mother liquor pump 26 along the pipeline to be further volatilized and crystallized; and the secondary steam enters the steam mechanical compressor 1 to be mechanically compressed after entering the secondary steam pipeline, and then enters the forced circulation heat exchanger 11 as the heat exchange medium.

[0045] As for the source steam inlet and outlet of the forced circulation heat exchanger 11, that is, the heat exchange medium inlet and the heat exchange medium outlet, no specific limitation is made here, and the existing technology can be used.

[0046] Obviously, the above-mentioned embodiments are only examples for clearly illustrating, and are not limitations to the embodiments. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A sodium sulfate crystallization apparatus, characterized by, The application relates to a sodium sulfate thickener comprising a thickener for receiving sodium sulfate slurry and a plurality of weighing modules arranged on a platform or support frame, a plurality of weighing ears are arranged on the outer sidewall of the thickener, and each weighing ear cooperates with each weighing module.

2. The sodium sulfate crystallization apparatus of claim 1, wherein, The crystallizer and the forced circulation heat exchanger are not provided with a salt foot structure; the lowermost end of the crystallizer is a material outlet, a material inlet is arranged on the sidewall above the material outlet, the forced circulation heat exchanger is provided with a circulating material inlet and a circulating material outlet, the circulating material inlet is communicated with the material outlet through a pipeline, the circulating material outlet is communicated with the material inlet through a pipeline, and a raw material liquid pipeline is further communicated with the pipeline between the circulating material inlet and the material outlet; the pipeline between the circulating material inlet and the material outlet is further connected with the thickener through a discharge pipeline and a discharge pump.

3. The sodium sulfate crystallization apparatus of claim 2, wherein, A forced circulation pump is arranged on the pipeline between the material outlet and the circulating material inlet.

4. The sodium sulfate crystallization apparatus of claim 2, wherein, The pipeline between the circulating material inlet and the material outlet at least comprises a vertical or inclined discharge pipeline directly connected with the material outlet.

5. The sodium sulfate crystallization apparatus of claim 2, wherein, The thickener is further connected with a centrifugal machine.

6. The sodium sulfate crystallization apparatus of claim 5, wherein, The liquid outlet of the thickener and the centrifugal liquid outlet of the centrifugal machine are communicated with a mother liquor tank through a pipeline.

7. The sodium sulfate crystallization apparatus of claim 6, wherein, The mother liquor tank is further communicated with the pipeline between the circulating material inlet and the material outlet through a mother liquor pump and a pipeline.

8. The sodium sulfate crystallization apparatus of any one of claims 2-7, wherein, The steam outlet of the crystallizer is communicated with a steam mechanical compressor through a secondary steam pipeline; the secondary steam pipeline comprises a horizontal gas inlet pipeline before a secondary steam inlet of the steam mechanical compressor, an air inlet pipeline higher than the horizontal gas inlet pipeline and connected with the other end of the horizontal gas inlet pipeline, and a remaining pipeline; the air inlet pipeline is a vertical air inlet pipeline or an inclined air inlet pipeline; at the position of the connection between the horizontal gas inlet pipeline and the air inlet pipeline, the air inlet pipeline is continuously extended along the axial direction below the horizontal gas inlet pipeline to form a liquid accumulation tank, or the air inlet pipeline is connected with a liquid accumulation tank through a connecting pipeline arranged below the horizontal gas inlet pipeline.

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