Static sodium sulfate crystallization device

Abstract

The utility model discloses a static sodium sulfate crystallization device which comprises a crystallization separator and a forced circulation heat exchanger, wherein the bottom of the crystallization separator is provided with a settling chamber; according to the scheme, the crystallization separator with the settling chamber and the forced circulation heat exchanger are arranged, the material inlet and the material outlet are formed in the crystallization separator, the circulating material inlet and the circulating material outlet are formed in the forced circulation heat exchanger, and the crystallization separator, the circulating material inlet and the circulating material outlet are connected through pipelines to form circulation. A material (sodium sulfate solution) heated by the forced circulation heat exchanger enters the crystallization separator to be evaporated, and then crystallized sodium sulfate crystals are settled under the action of gravity, fall into the settling chamber and are discharged from the settling chamber, so that sodium sulfate in the sodium sulfate solution is crystallized out, and a byproduct sodium sulfate and secondary steam are formed; sodium sulfate and secondary steam can be correspondingly applied in the later period, and the problem of storage of an existing sodium sulfate solution is solved.

Description

TECHNICAL FIELD

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

[0002] Organic aluminum hypophosphite is a kind of chemical substance with very high application value, it can be used as industrial catalyst, and has wide application in metal surface treatment field, simultaneously, it can also be used as sewage treatment agent and lithium ion battery positive electrode material, has wide application potential and market value.It has many preparation methods, such as organic hypophosphite-sodium aluminum sulfate method, in the method, it is to utilize the double decomposition reaction of organic hypophosphite and sodium aluminum sulfate to form organic aluminum hypophosphite precipitate and sodium sulfate solution, organic aluminum hypophosphite precipitate filters and flows down sodium sulfate solution, and sodium sulfate solution is used as by-product and is transported to storage system by pipeline to store up.Therefore, how to deal with more and more sodium sulfate solution becomes the technical problem to be solved urgently by the technical personnel in the field. SUMMARY

[0003] To solve the above technical problem, the utility model provides a static sodium sulfate crystallization device, including the crystallization separator with the settling chamber in bottom and the forced circulation heat exchanger, the side wall of the crystallization separator is provided with material inlet above the settling chamber, the side wall is provided with material outlet above the material inlet, the forced circulation heat exchanger is provided with circulating material inlet and circulating material outlet, the circulating material inlet is communicated with the material outlet by pipeline, the circulating material outlet is communicated with the material inlet by pipeline, the pipeline between the circulating material outlet and the material inlet is also communicated with raw material liquid pipeline, the crystallization outlet is formed below the settling chamber.In the above scheme, by setting the crystallization separator with the settling chamber and the forced circulation heat exchanger, then, the crystallization separator is provided with material inlet and material outlet, the forced circulation heat exchanger is provided with circulating material inlet and circulating material outlet, four are connected by pipeline, form circulation, the material (sodium sulfate solution) heated by forced circulation heat exchanger enters the crystallization separator and evaporates, then, the crystallized sodium sulfate crystal falls into the settling chamber under the action of gravity, and then is discharged from the settling chamber, so that the sodium sulfate in sodium sulfate solution is crystallized, forms by-product sodium sulfate and secondary steam, and the sodium sulfate and secondary steam can be applied in the later period, solve the problem of existing sodium sulfate solution storage.

[0004] In an embodiment, the pipeline between the circulating material outlet and the material inlet is provided with a forced circulation pump.By setting the forced circulation pump on the circulating pipeline, the material circulation between the crystallization separator and the forced circulation heat exchanger can be further guaranteed.

[0005] In one embodiment, the crystal slurry outlet is connected with the thickener through a pipeline and a discharge pump; the thickener is connected with a centrifuge. By setting the thickener and the centrifuge, the crystal slurry in the settling chamber is further treated and dewatered to obtain sodium sulfate crystals.

[0006] Further, the clear liquid outlet of the thickener and the centrifugal liquid outlet of the centrifuge are communicated with a mother liquor tank through pipelines. By setting the mother liquor tank, the clear liquid of the thickener and the centrifugal liquid of the centrifuge can be stored.

[0007] Further, the mother liquor tank is further communicated with the pipeline between the circulating material outlet and the material inlet through a mother liquor pump and a pipeline. By setting the mother liquor pump and the corresponding pipeline, the mixed liquid of the clear liquid of the thickener and the centrifugal liquid of the centrifuge in the mother liquor tank is added to the material circulation between the crystallization separator and the forced circulation heat exchanger, further heating the evaporative crystallization sodium sulfate crystals, reducing the discharge of waste water, and improving the yield of sodium sulfate crystals.

[0008] In one embodiment, the steam outlet of the crystallization separator is communicated with the 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 with the other end of the horizontal inlet pipe, and a remaining pipeline; at the position where the horizontal inlet pipe and the inlet pipe are connected, the inlet pipe is continued to extend axially below the horizontal inlet pipe to form a sump or is connected with a sump through a connecting pipe arranged below the horizontal inlet pipe. Through the above arrangement, the energy of the secondary steam of the crystallization separator can be effectively utilized. Further, by changing the position and structure of the condensate drainage port in the secondary steam pipeline, the condensate in the secondary steam is greatly reduced, thereby reducing the impact of the condensate 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 before the secondary steam in the inlet pipe enters the horizontal inlet pipe, the condensate in the secondary steam directly falls into the extended part of the inlet pipe or the connecting pipe through gravity. At this time, the content of condensate in the secondary steam entering the horizontal inlet pipe is greatly reduced. At the same time, there is basically no condensate 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 formed at the bottom of the horizontal inlet pipe, reducing secondary carrying (specifically, the airflow blows the condensate at the bottom of the horizontal inlet pipe, thereby carrying the condensate into the steam mechanical compressor). Therefore, the condensate in the secondary steam entering the steam mechanical compressor is greatly reduced, ensuring the stability of operation. Specifically, there are two technical solutions, one is to set the extended inlet pipe to form a sump, and the other is to connect the sump through a connecting pipe. In the connecting pipe, the thickness of the part connected with the inlet pipe is close to or preferably consistent with the thickness of the inlet pipe.

[0009] In one embodiment, a liquid blocking net is arranged in the pipeline at the connection between the horizontal inlet pipe and the inlet pipe. Through the arrangement of the liquid blocking net, the condensate in the secondary steam can adhere to the net and reduce the speed when passing through the liquid blocking net, thereby facilitating dripping.

[0010] In one embodiment, a liquid blocking structure is arranged in the extended part of the inlet pipe or in the connecting pipe. Through the arrangement of the liquid blocking structure, the secondary carrying of the liquid in the sump caused by the impact of the secondary steam can be prevented, thereby affecting the stable operation of the steam mechanical compressor.

[0011] Further, the liquid blocking structure is a mesh structure or a plate structure with openings. The condensate water is facilitated to drop, and the liquid caused by impact is blocked.

[0012] In an embodiment, the liquid blocking structure is a horn structure. The above functions are further realized, so that the liquid caused by impact is blocked to flow down along the side wall, and the effect is better.

[0013] In an embodiment, further comprising a liquid accumulation pump connected with the liquid accumulation tank, the liquid accumulation pump pumps away the water in the liquid accumulation tank. BRIEF DESCRIPTION OF DRAWINGS

[0014] 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 as follows. Obviously, the drawings described in the following are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0015] Figure 1 is a structural schematic view of a static sodium sulfate crystallization device of the present application;

[0016] Figure 2 is a structural schematic view of another static sodium sulfate crystallization device of the present application;

[0017] Figure 3 is a discharge schematic view of condensate water in the prior art;

[0018] Figure 4 is Figure 2 is an enlarged structural schematic view of A in FIG.

[0019] Figure 5 is Figure 2 is another enlarged structural schematic view of A in FIG.

[0020] The reference signs in the drawings are shown 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-settling chamber; 11-crystallization separator; 12-forced circulation heat exchanger; 13-material inlet; 14-material outlet; 15-circulating material inlet; 16-circulating material outlet; 17-raw material liquid pipeline; 18-crystal slurry outlet; 19-forced circulation pump; 20-thickening kettle; 21-centrifuge; 22-clear liquid outlet; 23-centrifugal liquid outlet; 24-mother liquor tank; 25-mother liquor pump; 26-steam outlet; 27-discharge pump. DETAILED DESCRIPTION

[0021] The content of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. In view of the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor also belong to the scope of protection of the present application.

[0022] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to 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.

[0023] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "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.

[0024] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0025] Embodiment 1

[0026] As Figure 1As shown, the embodiment discloses a static sodium sulfate crystallization device, which comprises a crystallization separator 11 with a settling chamber 10 at the bottom and a forced circulation heat exchanger 12, the sidewall of the crystallization separator 11 is provided with a material inlet 13 and a material outlet 14, wherein the material outlet 14 is higher than the material inlet 13, and the material inlet 13 is located above the settling chamber 10; the forced circulation heat exchanger 12 is provided with a circulating material inlet 15, a circulating material outlet 16, a heat exchange medium inlet and a heat exchange medium outlet, wherein the heat exchange medium is generally steam, the circulating material inlet 15 is communicated with the material outlet 14 through a pipeline, and the circulating material outlet 16 is communicated with the material inlet 13 through a pipeline, so that the material channel between the crystallization separator 11 and the forced circulation heat exchanger 12 forms a circulating channel, and the process is that the sodium sulfate solution material heated by the forced circulation heat exchanger 12 enters the crystallization separator 11 to evaporate and crystallize, the evaporated water vapor is discharged through a steam outlet 26 arranged at the top, and the crystals are settled into the settling chamber 10 by gravity, and then discharged through a crystal slurry outlet 18 arranged below the settling chamber 10, and the structure of the settling chamber 10 is not limited, as long as it can collect the settled sodium sulfate crystals, such as the salt leg structure in the prior art; and the position of the sodium sulfate solution material entering the circulating channel is not limited, in the embodiment, a raw material liquid pipeline 17 is connected on the pipeline between the circulating material outlet 16 and the material inlet 13, and the sodium sulfate solution material enters the circulating channel along the raw material liquid pipeline 17 to circulate.

[0027] In an embodiment, a forced circulation pump 19 is arranged on the pipeline between the circulating material outlet 16 and the material inlet 13, which further ensures the circulation of the material in the circulating channel.

[0028] In an embodiment, the crystal slurry outlet 18 is connected with a thickening kettle 20 through a pipeline and a discharge pump 27, and the thickening kettle 20 is connected with a centrifuge 21. That is, the crystal slurry passing through the crystal slurry outlet 18 enters the thickening kettle 20 along the pipeline with the assistance of the discharge pump 27, and after thickening in the thickening kettle 20, enters the centrifuge 21 to be centrifuged.

[0029] Further, the clear liquid outlet 22 of the thickening kettle 20 and the centrifuged liquid outlet 23 of the centrifuge 21 are communicated with a mother liquor tank 24 through a pipeline, that is, the thickened clear liquid and the centrifuged centrifuged liquid enter the mother liquor tank 24 for storage.

[0030] Further, the mother liquor tank 24 is also communicated with the pipeline between the circulating material outlet 16 and the material inlet 13 through a mother liquor pump 25 and a pipeline, that is, the liquid material stored in the mother liquor tank 24 is sent into the circulating channel by the mother liquor pump 25 to be further heated, evaporated and crystallized.

[0031] It should be noted that in order to facilitate control or maintenance, various valve bodies will be provided on the above-mentioned pipeline, which will not be described one by one.

[0032] Embodiment 2

[0033] As shown in Figure 2 and Figure 4 The embodiment discloses a static sodium sulfate crystallization device, which is a further design based on embodiment 1. The steam outlet 26 of the crystallization separator 11 is communicated with the steam mechanical compressor 1 through a secondary steam pipeline, and 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 pipeline. The secondary steam pipeline comprises a horizontal inlet pipe 2 before a secondary steam inlet of the steam mechanical compressor 1, an inlet pipe 6 which is higher than the horizontal inlet pipe 2 and is connected with the other end of the horizontal inlet pipe 2 in line, and a remaining pipeline. The horizontal inlet pipe 2 is a conventional inlet pipeline of the steam mechanical compressor 1, and its length is determined according to the design of the equipment, but generally will not be too long, about 1 m to 2 m, 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, and can be determined according to the comprehensive design of the equipment, and preferably a vertical structure, that is, a vertical inlet pipe, at this time, the liquid droplets contained in the secondary steam are more easily dropped downward due to gravity. At the position of the connection between the horizontal inlet pipe 2 and the inlet pipe 6, the inlet pipe 6 is continuously extended or extended below the horizontal inlet pipe to form a liquid trap 4. The mechanism after the extension or extension is not specifically limited, and preferably a pipe is provided, the horizontal inlet pipe 2 is connected with the pipe vertically or at an angle, preferably a three-way structure design, the part above the horizontal inlet pipe 2 is the inlet pipe 6, and the part below the horizontal inlet pipe 2 is closed as the liquid trap 4. In order to better illustrate the design, referring to the drainage design of the prior art before the secondary steam pipeline enters the steam mechanical compressor 1, as shown in Figure 3 The bottom of the horizontal inlet pipe is communicated with the liquid trap 4 through a relatively thin drainage pipe 3. Through comparison, the design changes the outlet position of the condensed water in the secondary steam, and changes the slow drainage speed of the drainage pipe 3 in the prior art (generally 1-inch pipe), which is prone to water accumulation at the bottom of the horizontal inlet pipe 2. In the design, the inlet pipe 6 is generally selected to have a pipe diameter of 18 inches or 20 inches, of course, not limited to the above-mentioned size. Through greatly reduced gas-liquid carrying, the impact of liquid on the compressor blades can be further reduced, and the stability can be improved.

[0034] In one embodiment, a liquid-blocking mesh 8 is installed inside 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 positioned to enter the horizontal air inlet pipe 2. The orientation is also not limited; it can be horizontal or vertical, depending on the location. It can also be inclined. In this embodiment, a 45-degree incline is preferred. Specifically, as shown... Figure 4 As shown, no specific restrictions are placed on the aperture of the liquid blocking mesh 8.

[0035] 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, a plate with openings for liquid to fall, and its shape is not limited. In this embodiment, the liquid-blocking structure 9 is a funnel-shaped structure, such as... Figure 4 As shown.

[0036] 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.

[0037] Regarding secondary steam, after exiting the steam outlet, it can first pass through a demister for demisting before entering the steam mechanical compressor.

[0038] Example 3

[0039] like Figure 5 As shown, this embodiment discloses a static sodium sulfate crystallization device, which is a further modification of Embodiment 2, specifically as follows: At the connection 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-like body 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, such as... Figure 5 As shown.

[0040] The usage process of this utility model is as follows:

[0041] The sodium sulfate solution enters the crystallization separator 11 through the material inlet 13 along the material liquid pipeline 17, reaches the position of the material outlet 14, enters the forced circulation heat exchanger 12 through the pipeline from the material outlet 14, is heated and warmed, then enters the crystallization separator 11 through the material inlet 13 along the pipeline from the circulating material outlet 16, and is volatilized and crystallized. In the process, the sodium sulfate crystals fall into the settling chamber 10, and the volatilized water vapor is discharged from the steam outlet 26 as secondary steam. The sodium sulfate solution continues to be heated and circulated between the crystallization separator 11 and the forced circulation heat exchanger 12, so that the volatilization and crystallization are carried out in the crystallization separator 11, forming a cycle. The crystal slurry formed by the sodium sulfate crystals in the settling chamber 10 enters the thickening kettle 20 through the crystal slurry outlet 18 along the pipeline with the assistance of the discharge pump 27, is thickened, then enters the centrifuge 21 for centrifugation, and the thickened clear liquid and the centrifuged liquid enter the mother liquor tank 24 for storage. The above-mentioned solution can also enter the circulating channel through the mother liquor pump 25 along the pipeline for further volatilization and crystallization. The secondary steam enters the steam mechanical compressor 1 for mechanical compression after entering the secondary steam pipeline, and is used as a heat exchange medium in the forced circulation heat exchanger 12.

[0042] As for the source steam inlet and outlet of the forced circulation heat exchanger 12, that is, the heat exchange medium inlet and the heat exchange medium outlet, no specific limitation is made here, and existing technologies can be used. The static description in the present design is defined as the static state of the sodium sulfate crystals obtained in the crystallization separator and settled in the settling chamber.

[0043] Obviously, the above-mentioned embodiments are only examples for clear illustration, and are not limitations on the embodiments. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. All the embodiments do not need to be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A static sodium sulfate crystallization apparatus, characterized by, The crystallization separator with a settling chamber in the bottom and the forced circulation heat exchanger; the crystallization separator is provided with a material inlet on the sidewall above the settling chamber, and a material outlet on the sidewall above the material inlet; 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 outlet and the material inlet; a crystal slurry outlet is formed below the settling chamber.

2. The static sodium sulfate crystallization apparatus of claim 1, wherein, A forced circulation pump is arranged on the pipeline between the circulating material outlet and the material inlet.

3. The static sodium sulfate crystallization apparatus of claim 1, wherein, The crystal slurry outlet is connected with a thickening kettle through a pipeline and a discharge pump; the thickening kettle is connected with a centrifuge.

4. The static sodium sulfate crystallization apparatus of claim 3, wherein, A clear liquid outlet of the thickening kettle and a centrifuged liquid outlet of the centrifuge are communicated with a mother liquor tank through a pipeline.

5. The static sodium sulfate crystallization apparatus of claim 4, wherein, The mother liquor tank is further communicated with the pipeline between the circulating material outlet and the material inlet through a mother liquor pump and a pipeline.

6. The static sodium sulfate crystallization apparatus of any one of claims 1-5, wherein, A 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 a secondary steam inlet of the steam mechanical compressor, an inlet pipe which is higher than the horizontal inlet pipe and connected with 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 of the connection between the horizontal inlet pipe and the inlet pipe, the inlet pipe is continuously extended below the horizontal inlet pipe along the axial direction to form an accumulation tank, or the inlet pipe is connected with an accumulation tank through a connecting pipe arranged below the horizontal inlet pipe.

7. The static sodium sulfate crystallization apparatus of claim 6, wherein, A liquid blocking net is arranged in the pipeline at the connection between the horizontal inlet pipe and the inlet pipe.

8. The static sodium sulfate crystallization apparatus of claim 6, wherein, A liquid blocking structure is arranged in the pipeline of the extended part of the inlet pipe or in the connecting pipe.

9. The static sodium sulfate crystallization apparatus of claim 8, wherein, The liquid blocking structure is a net structure or a plate structure with openings.

10. The static sodium sulfate crystallization apparatus of claim 9, wherein, The liquid blocking structure is a horn mouth structure.

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