CN216946296U - Freezing crystallization processing apparatus - Google Patents
Freezing crystallization processing apparatus Download PDFInfo
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- CN216946296U CN216946296U CN202220144516.3U CN202220144516U CN216946296U CN 216946296 U CN216946296 U CN 216946296U CN 202220144516 U CN202220144516 U CN 202220144516U CN 216946296 U CN216946296 U CN 216946296U
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Abstract
The utility model relates to a freezing crystallization treatment device, which belongs to the technical field of freezing crystallization and comprises a heat exchanger, wherein the material feeding end of the heat exchanger is connected with a feeding pipe; a material discharging end of the cold exchanger is provided with a primary discharging pipeline, the other end of the primary discharging pipeline is connected with a forced circulation cooler, a material outlet of the forced circulation cooler is connected with a secondary discharging pipeline, and the secondary discharging pipeline is connected with a freezing crystallizer; a material inlet end of the forced circulation cooler is provided with a circulating pipe, and a cooling circulating pump is arranged on the circulating pipe; the lower end circulation outlet of the freezing crystallizer is connected with the circulation pipe; the upper end of the freezing crystallizer is provided with a discharge port and is connected with a third-level discharge pipeline, and the other end of the third-level discharge pipeline is connected with a thickener; the overflow mouth of thickener is connected with raffinate recovery subassembly, and the thickener lower extreme is provided with the discharge end, is connected with product salt separation subassembly. The sodium sulfate in the wastewater can be recycled to the maximum extent, and the yield and quality of the sodium sulfate are improved.
Description
Technical Field
The utility model belongs to the technical field of freezing crystallization, and particularly relates to a freezing crystallization treatment device.
Background
The coal chemical industry is an industry with high energy consumption, high pollution and high water consumption, and along with the development of the modern coal chemical industry technology and the reasonable development of coal resources, the development of a corresponding wastewater treatment technology is urgently needed to timely and effectively treat the coal chemical industry wastewater.
The production process flow of the coal chemical industry is multiple and complicated, the water consumption is huge, various pollutants can be generated in each link, although most of the pollutants can be recovered, most of the residual pollutants in the wastewater are toxic, harmful and difficult-to-degrade pollutants, at present, 3 industrial chains of coal coking, coal gasification and coal liquefaction mainly exist in the development of the coal chemical industry, and the coal chemical industry wastewater is divided into three categories, namely coking wastewater, coal gasification wastewater and coal liquefaction wastewater.
The development direction of coal chemical industry wastewater treatment at present can improve the pretreatment effect by improving the pretreatment process and improving the technologies of oil removal, dephenolization and ammonia distillation; or adding dominant bacteria (such as dominant bacteria screened from nature or high-efficiency bacteria generated by gene combination technology into a bioreactor to remove one or a certain type of harmful substances) and developing a novel reactor to enhance the biological treatment effect and improve the treatment efficiency.
Conventionally, a softening and precipitating facility is adopted, flocculation precipitation and softening treatment are carried out in a precipitating tank to remove most of hardness, alkalinity, fluorine, silicon, suspended matters and the like, and then most of salt in water is removed by using a double-membrane method. The organic matter of the reverse osmosis concentrated water is enriched and treated by active carbon adsorption, the effluent enters a salt separation and quality separation crystallization working section for continuous treatment, and the inorganic salt can not be fully recovered, thereby causing the resource waste of the inorganic salt.
SUMMERY OF THE UTILITY MODEL
In view of the above problems in the prior art, an object of the present invention is to provide a freeze crystallization treatment apparatus capable of recovering and reusing sodium sulfate salt in wastewater to the maximum extent and improving the yield and quality of sodium sulfate salt.
In order to achieve the above object of the present invention, the present invention provides a technical solution as follows:
a freezing crystallization treatment device comprises a heat exchanger, wherein a material feeding end of the heat exchanger is connected with a feeding pipe; a primary discharging pipeline is arranged at the material discharging end of the cold exchanger, and the other end of the primary discharging pipeline is connected with a forced circulation cooler and is connected with a material inlet of the forced circulation cooler; a material outlet of the forced circulation cooler is connected with a secondary discharge pipeline, and the other end of the secondary discharge pipeline is connected with a freezing crystallizer and is connected with a feed inlet of the freezing crystallizer; a material inlet end of the forced circulation cooler is provided with a circulating pipe, and a cooling circulating pump is arranged on the circulating pipe; the lower end of the freezing crystallizer is provided with a circulating outlet, a circulating branch pipe is arranged on the circulating outlet, and the circulating branch pipe is connected with the circulating pipe; the upper end of the freezing crystallizer is provided with a discharge port and is connected with a third-stage discharge pipeline, and the other end of the third-stage discharge pipeline is connected with a thickener; the overflow mouth of thickener is connected with the raffinate and retrieves the subassembly, the thickener lower extreme is provided with the discharge end, and is connected with product salt separation subassembly.
Preferably, the raffinate recycling component comprises a freezing raffinate tank and a freezing raffinate pump, an overflow pipe is connected between the feed end of the freezing raffinate tank and the overflow port of the thickener, a raffinate cold recycling pipe is connected between the discharge end of the freezing raffinate tank and the cooling liquid inlet end of the cold exchanger, and the raffinate cold recycling pipe is connected with the freezing raffinate pump; and the cooling liquid outlet end of the cold exchanger is connected with a residual liquid outlet pipe.
Preferably, the product salt separation subassembly includes the separating centrifuge, the solid discharge end output product salt of separating centrifuge, the liquid discharge end is connected with freezing mother liquor jar, the discharge end of freezing mother liquor jar is connected with the mother liquor discharging pipe, the mother liquor discharging pipe with the circulating pipe intercommunication, just be provided with freezing mother liquor pump on the mother liquor discharging pipe.
Preferably, a feeding pump is arranged on the feeding pipe.
Preferably, a cold source feeding pipe and a cold source discharging pipe are arranged on the forced circulation cooler, and refrigerating fluid enters the forced circulation cooler through the cold source feeding pipe and is discharged out of the forced circulation cooler through the cold source discharging pipe.
Preferably, the heat exchanger is a shell-and-tube heat exchanger or a plate heat exchanger.
Preferably, the forced circulation cooler is a shell-and-tube cooler.
Preferably, the thickener is a thickening tank, a settling tank, a thickening tank or a cyclone.
The utility model provides a freezing crystallization treatment device, which is simple in process and strong in operability and can be used for recycling sodium sulfate in wastewater to the maximum extent through the arrangement of a cold exchanger, a forced circulation cooler, a freezing crystallizer, a thickener, a residual liquid recycling component and a product salt separation component, and the cold energy in the residual liquid can be recycled through recycling and cold exchanging of the overflowing residual liquid in the process. Through multistage gradual freezing, finally realize the refrigeration crystallization to the raw materials, simultaneously, through the circulation refrigeration crystallization to the mother liquor, very big improvement sodium sulfate yield and quality.
Drawings
FIG. 1 is a schematic structural view of a freezing and crystallizing treatment apparatus according to the present invention.
Reference numbers in the figures:
1a, exchanging coolers; 1b, a feeding pipe; 1c, a feed pump; 1d, a first-stage discharging pipeline;
2a, a forced circulation cooler; 2b, a secondary discharging pipeline; 2c, a circulation pipe; 2d, cooling a circulating pump; 2e, a cold source feeding pipe; 2f, a cold source discharge pipe;
3a, a freezing crystallizer; 3b, circulating branch pipes; 3c, a third-level discharge pipeline;
4a, a thickener;
500. a raffinate recovery module; 5a, a freezing residual liquid tank; 5b, a frozen residual liquid pump; 5c, an overflow pipe; 5d, a residual liquid cold energy recovery pipe; 5e, a residual liquid outlet pipe;
600. a product salt separation module; 6a, a separator; 6b, a frozen mother liquor tank; 6c, a mother liquor discharge pipe; 6d, a frozen mother liquor pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
The utility model provides a freezing crystallization treatment device, which is shown in figure 1 and comprises a heat exchanger 1a, a forced circulation cooler 2a, a freezing crystallizer 3a, a thickener 4a, a raffinate recovery assembly 500 and a product salt separation assembly 600. During work, materials needing to be frozen sequentially pass through the heat exchanger 1a, the freezing crystallizer 3a and the thickener 4a, product salt is recycled at the product salt separation assembly 600, and cold energy can be recycled through the arranged residual liquid recycling assembly 500.
Specifically, a material feeding end of the heat exchanger 1a is connected with a feeding pipe 1 b; a feed pump 1c is provided on the feed pipe 1 b. During operation, the material to be frozen and crystallized is pumped into the heat exchanger 1a through the feeding pipe 1b and the feeding pump 1c for primary heat exchange. Wherein, the heat exchanger 1a is a shell-and-tube type heat exchanger or a plate type heat exchanger.
The material discharge end of the cold exchanger 1a is provided with a first-level discharge pipeline 1d, and the other end of the first-level discharge pipeline 1d is connected with a forced circulation cooler 2a and is connected with a material inlet of the forced circulation cooler 2 a. The material outlet of the forced circulation cooler 2a is connected with a second-stage discharging pipeline 2b, and the other end of the second-stage discharging pipeline 2b is connected with a freezing crystallizer 3a and is connected with the feeding port of the freezing crystallizer 3 a. A material inlet end of the forced circulation cooler 2a is provided with a circulating pipe 2c, and the circulating pipe 2c is provided with a cooling circulating pump 2 d; the lower end of the freezing crystallizer 3a is provided with a circulating outlet, a circulating branch pipe 3b is arranged on the circulating outlet, and the circulating branch pipe 3b is connected with a circulating pipe 2 c.
The upper end of the freezing crystallizer 3a is provided with a discharge port which is connected with a third-level discharge pipeline 3c, and the other end of the third-level discharge pipeline 3c is connected with a thickener 4 a; the overflow mouth of thickener 4a is connected with raffinate recovery subassembly 500, and thickener 4a lower extreme is provided with the discharge end, and connects product salt separation subassembly 600.
The raffinate recycling component 500 comprises a freezing raffinate tank 5a and a freezing raffinate pump 5b, an overflow pipe 5c is connected between the feed end of the freezing raffinate tank 5a and an overflow port of the thickener 4a, a raffinate cold recycling pipe 5d is connected between the discharge end of the freezing raffinate tank 5a and the cooling liquid inlet end of the heat exchanger 1a, and the raffinate cold recycling pipe 5d is connected with the freezing raffinate pump 5 b; and the cooling liquid outlet end of the heat exchanger 1a is connected with a residual liquid outlet pipe 5 e.
The product salt separation assembly 600 comprises a separator 6a, a solid discharge end of the separator 6a outputs product salt, a liquid discharge end is connected with a freezing mother liquor tank 6b, a discharge end of the freezing mother liquor tank 6b is connected with a mother liquor discharge pipe 6c, the mother liquor discharge pipe 6c is communicated with a circulating pipe 2c, and a freezing mother liquor pump 6d is arranged on the mother liquor discharge pipe 6 c.
The forced circulation cooler 2a is provided with a cold source feeding pipe 2e and a cold source discharging pipe 2f, and the freezing liquid enters the forced circulation cooler 2a through the cold source feeding pipe 2e and is discharged out of the forced circulation cooler 2a through the cold source discharging pipe 2 f.
Finally, it should be noted that the forced circulation cooler 2a is a shell-and-tube cooler, and the thickener 4a is a thickener tank, a settling tank, a thickener tank, or a cyclone.
The specific crystallization steps are as follows:
the material to be crystallized enters the heat exchanger 1a through the feeding pipe 1b and the feeding pump 1 c. Precooling the material in the heat exchanger 1a, then precooling, feeding the precooled material into the forced circulation cooler 2a through the primary discharge pipeline 1d, carrying out forced refrigeration in the forced circulation cooler 2a, and carrying out freeze crystallization on the forcibly refrigerated material in the freeze crystallizer 3a to separate out solid salt. The solid-liquid mixture after freezing and crystallization enters the thickener 4a through a discharge pipe. The overflow material in the thickener 4a enters the freezing residual liquid tank 5a through the overflow pipe 5c, enters the cold exchanger 1a for cold exchange under the action of the freezing residual liquid pump 5b, recycles the cold energy of the cold exchanger, and then is discharged through the residual liquid outlet pipe 5 e. The material at the bottom of the thickener 4a enters a separator 6a for solid-liquid separation, the mother liquor passing through the separator 6a is collected into a freezing mother liquor tank 6b, and then enters a circulating pipe 2c for continuous freezing after passing through a freezing mother liquor pump 6d and a mother liquor discharging pipe 6c, and the product salt passing through the separator 6a is separately collected.
Specific examples are as follows:
waste water containing 12.8 wt% of sodium sulfate and 5.7 wt% of sodium chloride mixed salt at 30 ℃ enters through a feeding pipe 1b, enters a tube pass of a heat exchanger 1a under the pushing action of a feeding pump 1c, is cooled to 15 ℃ through the heat exchanger 1a, and is sent to a forced circulation cooler 2a through a primary discharging pipe 1d to be continuously cooled.
The forced circulation cooler 2a, the freezing crystallizer 3a and the cooling circulation pump 2d are connected through a circulation pipe 2c, cooled to 15 ℃ through the heat exchanger 1a and then sent to the freezing crystallizer 3a and the circulation pipe 2c through a primary discharge pipe 1d for continuous freezing crystallization. Meanwhile, 0 ℃ refrigerating fluid is introduced into the lower end of the shell pass of the forced circulation cooler 2a, and after secondary cooling, the temperature of the mixed salt wastewater containing 12.8 wt% of sodium sulfate and 5.7 wt% of sodium chloride at 15 ℃ is reduced to 2 ℃, and a large amount of mirabilite is separated out.
A discharge port is arranged on the freezing crystallizer 3a, a mixed liquor containing mirabilite is conveyed to a thickener 4a through the discharge port of the freezing crystallizer 3a for solid-liquid thickening, under the action of the thickener 4a, a residual liquor containing 1.1 wt% of sodium sulfate and 7.8 wt% of sodium chloride at 0 ℃ is collected to a freezing residual liquor tank 5a through an overflow pipe 5c of the thickener 4a, under the action of a freezing residual liquor pump 5b, a residual liquor containing 1.1 wt% of sodium sulfate and 7.8 wt% of sodium chloride at 0 ℃ is conveyed to a lower pipe opening of a shell side of a heat exchanger 1a, the waste water containing 12.8 wt% of sodium sulfate and 5.7 wt% of sodium chloride mixed salt at 15 ℃ in a pipe side of the heat exchanger 1a is cooled, and the residual liquor containing 1.1 wt% of sodium sulfate and 7.8 wt% of sodium chloride at 10 ℃ after cooling is discharged out of a system.
The bottom of a thickener 4a containing a large amount of mirabilite solids enters a separator 6a, under the centrifugal action of the separator 6a, product mirabilite solid salt separated by the separator 6a is separately collected, mother liquor containing 1.1 wt% of sodium sulfate and 7.8 wt% of sodium chloride at 0 ℃ is collected to a freezing mother liquor tank 6b through a mother liquor pipe, under the action of a freezing mother liquor pump 6d, residual liquor containing 1.1 wt% of sodium sulfate and 7.8 wt% of sodium chloride at 0 ℃ is sent to a material circulating pipe 2c of a forced circulation cooler 2a for continuous freezing crystallization, and residual mirabilite solids are separated out and continuously recovered.
The utility model provides a freezing crystallization treatment device, which can recycle sodium sulfate in wastewater through a heat exchanger 1a, a forced circulation cooler 2a, a freezing crystallizer 3a, a thickener 4a, a residual liquid recycling component 500 and a product salt separation component 600, and can recycle cold energy in the overflow residual liquid by recycling and cold exchanging the residual liquid in the process. Through multistage gradual freezing, finally realize the refrigeration crystallization to the raw materials, simultaneously, through the circulation refrigeration crystallization to the mother liquor, very big improvement sodium sulfate yield and quality.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The embodiments and features of the embodiments of the utility model may be combined with each other without conflict.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A freezing crystallization processing device is characterized in that: the device comprises a heat exchanger (1a), wherein a material feeding end of the heat exchanger (1a) is connected with a feeding pipe (1 b);
a primary discharging pipeline (1d) is arranged at the material discharging end of the air exchanger (1a), and the other end of the primary discharging pipeline (1d) is connected with a forced circulation cooler (2a) and is connected with a material inlet of the forced circulation cooler (2 a);
a material outlet of the forced circulation cooler (2a) is connected with a secondary discharge pipeline (2b), and the other end of the secondary discharge pipeline (2b) is connected with a freezing crystallizer (3a) and is connected with a feed inlet of the freezing crystallizer (3 a);
a material inlet end of the forced circulation cooler (2a) is provided with a circulating pipe (2c), and a cooling circulating pump (2d) is arranged on the circulating pipe (2 c);
a circulating outlet is formed in the lower end of the freezing crystallizer (3a), a circulating branch pipe (3b) is arranged on the circulating outlet, and the circulating branch pipe (3b) is connected with the circulating pipe (2 c);
a discharge hole is formed in the upper end of the freezing crystallizer (3a), a third-level discharge pipeline (3c) is connected to the upper end of the freezing crystallizer, and a thickener (4a) is connected to the other end of the third-level discharge pipeline (3 c);
the overflow mouth of thickener (4a) is connected with raffinate recovery subassembly (500), thickener (4a) lower extreme is provided with the discharge end, and is connected with product salt separable set (600).
2. The apparatus according to claim 1, wherein: the raffinate recycling component (500) comprises a freezing raffinate tank (5a) and a freezing raffinate pump (5b), an overflow pipe (5c) is connected between the feed end of the freezing raffinate tank (5a) and an overflow port of the thickener (4a), a raffinate cold recycling pipe (5d) is connected between the discharge end of the freezing raffinate tank (5a) and the cooling liquid inlet end of the cold exchanger (1a), and the raffinate cold recycling pipe (5d) is connected with the freezing raffinate pump (5 b);
and the cooling liquid outlet end of the heat exchanger (1a) is connected with a residual liquid outlet pipe (5 e).
3. The processing apparatus for freezing crystallization according to claim 1, wherein: product salt separable set (600) includes separating centrifuge (6a), the solid discharge end output product salt of separating centrifuge (6a), the liquid discharge end is connected with freezing mother liquor jar (6b), the discharge end of freezing mother liquor jar (6b) is connected with mother liquor discharging pipe (6c), mother liquor discharging pipe (6c) with circulating pipe (2c) intercommunication, just be provided with freezing mother liquor pump (6d) on mother liquor discharging pipe (6 c).
4. The apparatus according to claim 1, wherein: the feeding pipe (1b) is provided with a feeding pump (1 c).
5. The processing apparatus for freezing crystallization according to claim 1, wherein: be provided with cold source inlet pipe (2e) and cold source discharging pipe (2f) on forced circulation cooler (2a), the cryogenic fluid gets into through cold source inlet pipe (2e) forced circulation cooler (2a), through cold source discharging pipe (2f) are discharged forced circulation cooler (2 a).
6. The processing apparatus for freezing crystallization according to claim 1, wherein: the heat exchanger (1a) is a shell-and-tube type heat exchanger or a plate type heat exchanger.
7. The apparatus according to claim 1, wherein: the forced circulation cooler (2a) is a shell-and-tube cooler.
8. The apparatus according to claim 1, wherein: the thickener (4a) is a thickening tank, a settling tank, a thickening tank or a cyclone.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220144516.3U CN216946296U (en) | 2022-01-19 | 2022-01-19 | Freezing crystallization processing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220144516.3U CN216946296U (en) | 2022-01-19 | 2022-01-19 | Freezing crystallization processing apparatus |
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| CN216946296U true CN216946296U (en) | 2022-07-12 |
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| CN202220144516.3U Active CN216946296U (en) | 2022-01-19 | 2022-01-19 | Freezing crystallization processing apparatus |
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