High-salinity wastewater evaporation crystallization device

Abstract

The utility model provides a kind of high-salinity wastewater evaporation crystallization device, it is related to high-salinity wastewater evaporation crystallization technical field, comprising: separation system, separation system includes the feed unit and separation unit connected in turn;Drying system, drying system includes the drying unit and dust removal unit connected in turn, drying unit is connected with separation unit, dust removal unit includes water film dust catcher, water film dust catcher is provided with observation port, liquid supplementing port and overflow port, liquid supplementing port is connected with feed unit by liquid supplementing pipeline, overflow port is connected with feed unit by overflow pipeline, observation port is used to observe overflow port at liquid level;The problem of multiple control points and interlock control module in the high-salinity wastewater evaporation crystallization device in the above prior art, high operating cost and high operation difficulty are solved.

Description

Technical Field

[0001] This utility model belongs to the field of high-salt wastewater evaporation and crystallization technology, and more specifically, relates to a high-salt wastewater evaporation and crystallization device. Background Technology

[0002] In the evaporation and crystallization process of high-salt wastewater, a single evaporation and crystallization unit has numerous control points, including various interlocking controls for temperature, liquid level, conductivity, and valves. Especially in fluidized bed drying systems, it is necessary to monitor not only the solid moisture content from the separator to the fluidized bed but also the flow state of the solid salt within the fluidized bed to prevent solid blockage of the discharge port. Simultaneously, the water replenishment and drainage of the dust removal unit in the fluidized bed drying system must be carefully managed, significantly increasing the operational complexity of the evaporation and crystallization unit. Ensuring stable system operation requires substantial investment of manpower and resources. Furthermore, traditional fluidized bed drying systems typically use condensate from the evaporation process for water replenishment to the water film dust collector, indirectly increasing the operating load of the evaporation system and raising overall operating costs. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a high-salt wastewater evaporation and crystallization device, which solves the problems of numerous control points and interlocking control modules, high operating costs, and high operational difficulty in existing high-salt wastewater evaporation and crystallization devices.

[0004] To achieve the above objectives, this utility model provides a high-salt wastewater evaporation and crystallization device, comprising:

[0005] A separation system comprising a feeding unit and a separation unit connected in sequence;

[0006] The drying system includes a drying unit and a dust removal unit connected in sequence. The drying unit is connected to the separation unit. The dust removal unit includes a water film dust collector, which is provided with an observation port, a liquid replenishment port, and an overflow port. The liquid replenishment port is connected to the feeding unit through a liquid replenishment pipeline, and the overflow port is connected to the feeding unit through an overflow pipeline. The observation port is used to observe the liquid level at the overflow port.

[0007] Optionally, a temperature sensor is provided at the lower part of the water film dust collector, and the temperature sensor is used to detect the temperature of the liquid inside the water film dust collector.

[0008] Optionally, a regulating valve is provided on the replenishment pipeline.

[0009] Optionally, the regulating valve is a manual regulating valve.

[0010] Optionally, the feeding unit includes a feeding pipeline, a feeding tank, a feeding pump, a primary preheater, a mother liquor tank, a mother liquor pump, and a secondary preheater connected in sequence, and the overflow pipeline is connected to the mother liquor tank.

[0011] Optionally, the replenishment line is connected to the outlet end of the feed pump.

[0012] Optionally, the separation unit includes an evaporator separator, a discharge pump, and a separator connected in sequence. The evaporator separator is connected to the secondary preheater, the first outlet of the separator is connected to the mother liquor tank, and the second outlet of the separator is connected to the drying unit.

[0013] Optionally, the evaporator separator includes a heater and a separator, wherein the heater and the separator are connected via a circulation pipe and a forced circulation pump is provided on the circulation pipe.

[0014] Optionally, the drying unit includes a crystallization salt pipeline, a drying bed, and a cyclone separator connected in sequence. The crystallization salt pipeline is connected to the second outlet. The drying bed is connected to a blower and a preheater. The outlet end of the cyclone separator is equipped with an induced draft fan, which is connected to the water film dust collector through the induced draft fan.

[0015] Optionally, the water film dust collector is provided with a circulation pipeline, and a circulation pump is provided on the circulation pipeline.

[0016] This utility model provides a high-salt wastewater evaporation and crystallization device, the advantages of which are as follows: the high-salt wastewater evaporation and crystallization device is equipped with an observation port, a liquid replenishment port, and an overflow port on the water film dust collector. The liquid replenishment port is connected to a liquid replenishment pipeline to replenish the water film dust collector. Due to the setting of the overflow port, liquid replenishment can be carried out continuously, and overflow can be continuously carried out through the overflow port and overflow pipeline to maintain a stable liquid level in the water film dust collector. This setting reduces the need for a remote liquid level gauge and a matching automatic water replenishment valve on the water film dust collector, as well as a conductivity meter and an automatic drain valve on the water film dust collector. The continuous water replenishment and continuous overflow replaces the intermittent water replenishment and intermittent drainage, thereby reducing the number of control points and interlocking control modules, reducing operating costs and operating difficulty.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0019] Figure 1A schematic diagram of the separation system of a prior art high-salt wastewater evaporation and crystallization device is shown.

[0020] Figure 2 A schematic diagram of the drying system of a prior art high-salt wastewater evaporation and crystallization apparatus is shown.

[0021] Figure 3 A schematic diagram of the separation system of a high-salt wastewater evaporation and crystallization apparatus according to an embodiment of the present invention is shown.

[0022] Figure 4 A schematic diagram of the drying system of a high-salt wastewater evaporation and crystallization apparatus according to an embodiment of the present invention is shown.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Feed tank; 2. Feed pump; 3. Primary preheater; 4. Secondary preheater; 5. Forced circulation pump; 6. Heater; 7. Separator; 8. Discharge pump; 9. Separator; 10. Mother liquor tank; 11. Mother liquor pump; 12. Condensate tank; 13. Condensate pump; 14. Blower; 15. Preheater; 16. Fluidized bed dryer; 17. Cyclone separator; 18. Exhaust fan; 19. Water film dust collector; 20. Circulation pump; 21. Temperature sensor; 22. Automatic drain valve; 23. Remote level gauge; 24. Automatic water replenishment valve; 25. Conductivity meter; 26. Feed line; 27. Condensate drain line; 28. Water replenishment line; 29. ​​Crystallization salt line; 30. Drain pipe; 31. Manual regulating valve; 32. Observation mirror; 33. Liquid replenishment line; 34. Overflow line. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0026] like Figure 1 and Figure 2As shown, a prior art high-salt wastewater evaporation crystallization device separates high-salt wastewater raw liquid through its separation system, outputs crystallized salt through separator 9, and then dries and removes dust through its drying system. A remote level gauge 23 and an automatic water supply valve 24 are installed at the lower part of the water film dust collector 19, and a conductivity meter 25 and an automatic drain valve 22 are connected to the circulation pipeline of the water film dust collector 19. The automatic drain valve 22 is installed on the external discharge pipe 30. The automatic water supply valve 24 is interlocked with the remote level gauge 23, and the automatic drain valve 22 is interlocked with the conductivity meter 25. The water supply pipeline 28 is connected to the condensate outlet of the first-stage preheater 3 and can be connected to the condensate external discharge pipeline 27 to use the condensate from the evaporation separator 7 for replenishment.

[0027] like Figure 3 and Figure 4 As shown, this utility model provides a high-salt wastewater evaporation and crystallization device, comprising:

[0028] The separation system includes a feeding unit and a separation unit connected in sequence;

[0029] The drying system includes a drying unit and a dust removal unit connected in sequence. The drying unit is connected to the separation unit. The dust removal unit includes a water film dust collector 19. The water film dust collector 19 is provided with an observation port, a liquid replenishment port and an overflow port. The liquid replenishment port is connected to the feeding unit through a liquid replenishment pipeline 33, and the overflow port is connected to the feeding unit through an overflow pipeline 34. The observation port is used to observe the liquid level at the overflow port.

[0030] Specifically, to address the issues of numerous control points and interlocking control modules, resulting in high operating costs and operational difficulties in existing high-salt wastewater evaporation and crystallization devices, this invention provides a high-salt wastewater evaporation and crystallization device with an observation port, a replenishment port, and an overflow port on the water film dust collector 19. The replenishment port is connected to a replenishment pipeline 33, which replenishes the water film dust collector 19. Due to the overflow port, replenishment can be continuous, and overflow can occur continuously through the overflow port and overflow pipeline 34, maintaining a stable liquid level within the water film dust collector 19. This design reduces the need for a remote level gauge 23 and a matching automatic water replenishment valve 24 on the water film dust collector 19, as well as a conductivity meter 25 and an automatic drain valve 22. By replacing intermittent replenishment and drainage with continuous replenishment and overflow, the design reduces control points and interlocking control modules, lowers operating costs, and simplifies operation.

[0031] Optionally, a temperature sensor 21 is provided at the lower part of the water film dust collector 19, which is used to detect the temperature of the liquid inside the water film dust collector 19.

[0032] Specifically, the temperature of the liquid inside the water film dust collector 19 is detected by the temperature sensor 21 to prevent it from getting too hot. When the temperature exceeds the set temperature, the temperature can be brought down below the set temperature by increasing the amount of liquid replenished.

[0033] Optionally, a regulating valve is provided on the replenishment line 33.

[0034] Specifically, the adjustable valve is designed to facilitate the adjustment of the replenishment volume.

[0035] Optionally, the regulating valve is a manual regulating valve 31.

[0036] Specifically, the regulating valve is used when the high-salt wastewater evaporation and crystallization device is started. By slowly opening the manual regulating valve 31 and observing the overflow at the overflow port through the observation port, the amount of liquid replenished is just enough to cause liquid to overflow at the overflow port. Afterwards, during subsequent operation, it is only necessary to observe the detection result of the temperature sensor 21. If the temperature does not exceed the set temperature, there is no need to adjust the manual regulating valve 31. If the temperature exceeds the set temperature, the opening of the manual regulating valve 31 is slowly increased to increase the amount of liquid replenished and the overflow, so that the temperature drops below the set temperature.

[0037] Optionally, the feeding unit includes a feeding pipeline 26, a feeding tank 1, a feeding pump 2, a primary preheater 3, a mother liquor tank 10, a mother liquor pump 11, and a secondary preheater 4 connected in sequence, and an overflow pipeline 34 is connected to the mother liquor tank 10.

[0038] Specifically, the high-salt wastewater raw liquid enters the feed tank 1 through the feed pipeline 26, and then enters the primary preheater 3 and the mother liquor tank 10 in sequence under the action of the feed pump 2. After that, it enters the secondary preheater 4 and the separation unit in sequence under the action of the mother liquor pump 11.

[0039] Optionally, the replenishment line 33 is connected to the outlet end of the feed pump 2.

[0040] Specifically, the high-salt wastewater evaporation crystallization device in the prior art uses the condensate from the evaporator separator 7 for replenishment, while the replenishment pipeline 33 of the high-salt wastewater evaporation crystallization device in this invention is connected to the outlet end of the feed pump 2, using the high-salt wastewater raw liquid output by the feed pump 2 for replenishment, indirectly reducing the processing load of the separation system and saving operating costs.

[0041] Optionally, the separation unit includes an evaporator separator 7, a discharge pump 8, and a separator 9 connected in sequence. The evaporator separator 7 is connected to the secondary preheater 4, the first outlet of the separator 9 is connected to the mother liquor tank 10, and the second outlet of the separator 9 is connected to the drying unit.

[0042] Specifically, the preheated high-salt wastewater raw liquid is evaporated and crystallized in the evaporator separator 7, and then output to the separator 9 for centrifugal separation through the discharge pump 8. The first outlet of the separator 9 outputs the mother liquor to the mother liquor tank 10, and the second outlet of the separator 9 outputs the finished salt to the drying unit.

[0043] In this embodiment, the primary preheater 3 and the secondary preheater 4 both use the condensate from the evaporator separator 7 as a water source to preheat the high-salt wastewater raw liquid.

[0044] Optionally, the evaporator separator 7 includes a heater 6 and a separator 7, wherein the heater 6 and the separator 7 are connected by a circulation pipe and a forced circulation pump 5 is provided on the circulation pipe.

[0045] Specifically, heater 6 is circulated with separator 7 and is forced to circulate under the action of forced circulation pump 5. Discharge pump 8 can be connected to circulation pipe.

[0046] Optionally, the drying unit includes a crystallization salt pipeline 29, a drying bed, and a cyclone separator 17 connected in sequence. The crystallization salt pipeline 29 is connected to the second outlet of the separator 9. The drying bed is connected to a blower 14 and a preheater 15. The outlet end of the cyclone separator 17 is provided with an induced draft fan 18, which is connected to a water film dust collector 19 through the induced draft fan 18.

[0047] Specifically, the finished salt is fed into the drying bed through the crystallization salt pipeline 29 for drying. The blower 14 delivers air and heats it through the preheater 15. The exhaust gas output from the drying bed passes through the cyclone separator 17 and is then fed into the water film dust collector 19 through the induced draft fan 18 for dust removal.

[0048] In this embodiment, the drying bed is a fluidized bed drying bed 16.

[0049] Optionally, the water film dust collector 19 is equipped with a circulation pipeline, and a circulation pump 20 is installed on the circulation pipeline.

[0050] Specifically, the lower end of the circulation pipeline is connected to the lower part of the water film dust collector 19, and the upper end of the circulation pipeline is connected to the upper part of the water film dust collector 19.

[0051] In summary, when using the high-salt wastewater evaporation and crystallization device provided by this utility model, taking a single operation as an example: the high-salt wastewater raw liquid enters the feed tank 1 through the feed pipeline 26, and then passes through the primary preheater 3 and the mother liquor tank 10 under the action of the feed pump 2. Then, under the action of the mother liquor pump 11, it passes through the secondary preheater 4 and enters the evaporation separator 7. The high-salt wastewater raw liquid is heated by steam in the heater 6 and evaporates and crystallizes in the separator 7. The crystal slurry is transported to the separator 9 through the discharge pump 8. After centrifugal separation, the crystallized salt is transported to the drying bed for drying through the crystallization salt pipeline 29. The condensate generated by the heater 6 enters the condensate tank 12, and then is sent to the secondary preheater 4 and the primary preheater 3 through the condensate pump 13. The air blown in by the blower 14 passes through the preheater... 15. Heating, then entering the drying bed to mix and dry with crystallized salt. The exhaust gas passes through cyclone separator 17 and enters water film dust collector 19 through induced draft fan 18. The replenishment liquid of water film dust collector 19 enters through replenishment pipeline 33 and circulates within water film dust collector 19 through circulation pump 20 and circulation pipeline. When starting up, the replenishment liquid volume is controlled by manual adjustment valve 31. Observe the observation glass 32 on the observation port and slowly open manual adjustment valve 31 until liquid just overflows from the overflow port. During operation, observe the detection result of temperature sensor 21. When it exceeds 60℃, slowly increase the opening of manual adjustment valve 31 to avoid excessive temperature and maintain the temperature below 60℃, while keeping the replenishment and overflow of water film dust collector 19 continuous.

[0052] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A high-salt wastewater evaporation and crystallization device, characterized in that, include: A separation system comprising a feeding unit and a separation unit connected in sequence; The drying system includes a drying unit and a dust removal unit connected in sequence. The drying unit is connected to the separation unit. The dust removal unit includes a water film dust collector, which is provided with an observation port, a liquid replenishment port, and an overflow port. The liquid replenishment port is connected to the feeding unit through a liquid replenishment pipeline, and the overflow port is connected to the feeding unit through an overflow pipeline. The observation port is used to observe the liquid level at the overflow port.

2. The high-salinity wastewater evaporation and crystallization apparatus according to claim 1, characterized in that, A temperature sensor is installed at the bottom of the water film dust collector, and the temperature sensor is used to detect the temperature of the liquid inside the water film dust collector.

3. The high-salt wastewater evaporation and crystallization apparatus according to claim 1, characterized in that, The replenishment pipeline is equipped with a regulating valve.

4. The high-salt wastewater evaporation and crystallization apparatus according to claim 3, characterized in that, The regulating valve is a manual regulating valve.

5. The high-salt wastewater evaporation and crystallization apparatus according to claim 1, characterized in that, The feeding unit includes a feeding pipeline, a feeding tank, a feeding pump, a primary preheater, a mother liquor tank, a mother liquor pump, and a secondary preheater connected in sequence, and the overflow pipeline is connected to the mother liquor tank.

6. The high-salt wastewater evaporation and crystallization apparatus according to claim 5, characterized in that, The replenishment line is connected to the outlet end of the feed pump.

7. The high-salt wastewater evaporation and crystallization apparatus according to claim 5, characterized in that, The separation unit includes an evaporator separator, a discharge pump, and a separator connected in sequence. The evaporator separator is connected to the secondary preheater. The first outlet of the separator is connected to the mother liquor tank, and the second outlet of the separator is connected to the drying unit.

8. The high-salinity wastewater evaporation and crystallization apparatus according to claim 7, characterized in that, The evaporator separator includes a heater and a separator, wherein the heater and the separator are connected by a circulation pipe and a forced circulation pump is provided on the circulation pipe.

9. The high-salinity wastewater evaporation and crystallization apparatus according to claim 7, characterized in that, The drying unit includes a crystallization salt pipeline, a drying bed, and a cyclone separator connected in sequence. The crystallization salt pipeline is connected to the second outlet. The drying bed is connected to a blower and a preheater. The outlet end of the cyclone separator is equipped with an induced draft fan, which is connected to the water film dust collector through the induced draft fan.

10. The high-salinity wastewater evaporation and crystallization apparatus according to claim 1, characterized in that, The water film dust collector is equipped with a circulation pipeline, and a circulation pump is installed on the circulation pipeline.

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