Energy-saving vacuum flash evaporation high-salinity wastewater evaporation dewatering device

Abstract

The utility model relates to high salt wastewater treatment technical field, concretely relates to energy -conserving vacuum flash evaporation high salt wastewater evaporation dewatering device. Including the flash tower, the upper end of flash tower is fixedly connected with steam pipeline, is installed with suction pump on steam pipeline, is fixed with the spray subassembly in the upper end of flash tower, the liquid inlet pipeline is connected with the spray subassembly, the liquid inlet pipeline is connected with the tube pass of heat exchanger, the spray subassembly is fixed in the cone cover, the cone cover is fixed in the flash tower, the inside of cone cover lateral wall is hollow, the inner chamber of cone cover lateral wall is connected with heating medium pipeline, is installed with heater on heating medium pipeline, the lower ring pipe is fixed in the flash tower below the cone cover, a plurality of lower spray heads are fixedly connected with the lower ring pipe upper end, and the circulating pipeline is connected with the lower end of flash tower and lower ring pipe. The high temperature water vapor of steam pipeline is entered into the heat exchanger shell pass and exchanges heat with the liquid inlet mother liquor, realizes the sufficient preheating to the mother liquor, directly utilizes the waste steam waste heat, reduces the external heat source input.

Description

Technical Field

[0001] This utility model relates to the field of high-salt wastewater treatment technology, specifically to an energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater. Background Technology

[0002] High-salinity wastewater treatment is a common challenge in chemical, pharmaceutical, and seawater desalination industries. This wastewater contains large amounts of salts such as sodium chloride and sodium sulfate. Traditional evaporation dehydration technologies generally suffer from high energy consumption, low thermal efficiency, and insufficient operational stability. Existing flash evaporation units typically rely on external heat sources to directly heat the mother liquor, resulting in ineffective recovery of steam waste heat and significant energy waste. Simultaneously, the limited evaporation area of ​​the mother liquor makes it difficult to improve water removal efficiency. During negative pressure flash evaporation, rising steam is prone to condensation and reflux due to temperature drops, increasing the mother liquor circulation load and exacerbating the risk of equipment scaling.

[0003] Some existing equipment reduces energy consumption by preheating the liquid feed, but the preheating efficiency is limited by the heat exchange structure and lacks a mechanism to maintain the steam temperature inside the tower, failing to resolve the contradiction between evaporation efficiency and energy consumption control. Therefore, a new type of evaporation dehydration device integrating cascaded utilization of thermal energy, anti-condensation design, and high-efficiency atomization structure is needed to achieve energy saving and high efficiency in the treatment of high-salt wastewater. Utility Model Content

[0004] The main purpose of this invention is to provide an energy-saving vacuum flash evaporation dehydration device for high-salt wastewater that can improve wastewater dehydration efficiency and effectively utilize the heat of water vapor.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: An energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater includes a flash tower. A liquid outlet pipeline is fixedly connected to the lower end of the flash tower, and a steam pipeline is fixedly connected to the upper end of the flash tower. A suction pump is installed on the steam pipeline, which is connected to the shell side of a heat exchanger. A spray assembly is fixedly installed inside the upper end of the flash tower, and an inlet pipeline is connected to the spray assembly. A booster pump is installed on the inlet pipeline, which is connected to the tube side of the heat exchanger. The spray assembly is fixed inside a conical sleeve, which is also fixed inside the flash tower. The sidewall of the conical sleeve is hollow, and its inner cavity is connected to a heating medium pipeline. A heater is installed on the heating medium pipeline, which is partially arranged in a serpentine pattern inside the lower end of the flash tower. A lower ring pipe is fixedly installed inside the flash tower below the conical sleeve, and multiple lower nozzles are fixedly connected to the upper end of the lower ring pipe. A circulation pipeline connects the lower end of the flash tower and the lower ring pipe, and a first circulation pump is installed on the circulation pipeline.

[0006] Specifically, the shell side of the heat exchanger is connected to the shell side of the condenser, and the cooling water flows through the tube side of the condenser.

[0007] Specifically, the diameter of the upper end of the cone sleeve is larger than the diameter of the lower end.

[0008] Specifically, the spray assembly is shaped like an inverted pagoda and includes multiple circular distributors. The diameter of the multiple circular distributors decreases from top to bottom. The multiple distributors are concentric and interconnected. Multiple upper nozzles are evenly distributed and fixedly connected to the outer edge of the distributors. The outlet end of the upper nozzle faces the inner wall of the conical sleeve.

[0009] Specifically, a fixing rod is fixed on the topmost distributor, and the fixing rod is fixed inside the cone sleeve. The liquid inlet line is connected to the topmost distributor.

[0010] Specifically, the lower part of the conical sleeve is fixed in the inner hole of the fixing ring, and multiple through holes are evenly distributed around the circumference of the fixing ring, with the through holes close to the conical sleeve.

[0011] Specifically, the heater has a built-in second circulation pump.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The high-temperature steam discharged from the steam pipeline enters the shell side of the heat exchanger and exchanges heat with the mother liquor, thereby fully preheating the mother liquor and directly utilizing the waste heat of the waste steam, reducing the input of external heat sources.

[0013] 2. The heating medium circulating inside the cone sleeve continuously heats the cone sleeve, causing the spray mother liquor to heat up again when it comes into contact with the inner wall of the cone sleeve; the outer wall of the cone sleeve serves as a hot surface to maintain the temperature of the rising steam, avoiding the need for additional heating units; the steam after heat exchange enters the condenser and is condensed by cooling water, achieving complete recovery of the latent heat of the steam and maximizing the system's thermal energy utilization rate.

[0014] 3. The fixed ring with perforations guides the rising steam to flow closely against the high-temperature outer wall of the cone sleeve, continuously compensating for heat loss and completely avoiding the dilution of mother liquor concentration and increased energy consumption caused by steam condensation and reflux; the inverted pagoda-shaped spray assembly, in conjunction with the inner wall of the cone sleeve, forms a uniform liquid film and enhances heat transfer; the ring pipe atomizes and sprays the heated mother liquor, increasing the evaporation area and accelerating water removal; the suction pump maintains the negative pressure of the flash evaporator, lowers the boiling point of the mother liquor, achieves low-temperature and high-efficiency evaporation, and reduces the risk of decomposition of heat-sensitive substances.

[0015] 4. The coaxial inverted cone structure of the cone sleeve and the spray assembly optimizes the upward path of steam and the distribution of droplets, reducing the dead zone of flow; the uniformly distributed perforated design of the fixing ring ensures uniform contact between steam and the outer wall of the cone sleeve.

[0016] 5. The heating medium forms a closed loop flow in the serpentine pipeline, the conical cavity, and the bottom of the flash tower to achieve zoned temperature control for mother liquor preheating, evaporation, and reheating; the first and second circulation pumps regulate the flow rates of mother liquor and heating medium in stages to avoid system interference.

[0017] 6. The mother liquor is preheated and then sprayed in an atomized manner to reduce the precipitation and scaling of salts caused by temperature shock; the condenser ensures that the steam is completely liquefied and discharged to prevent the accumulation of uncondensed gas from affecting the vacuum level.

[0018] 7. The multi-stage distributor design of the inverted pagoda spray assembly can adjust the coverage area of ​​mother liquor with different salt concentrations to adapt to fluctuations in influent flow rate; the cone sleeve and the spray assembly are connected by a fixed rod, which facilitates disassembly, cleaning or replacement of the upper spray head. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention.

[0020] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0021] The components in the attached diagram are named as follows: 1. Flash tower, 2. Inlet pipeline, 3. Booster pump, 4. Distributor, 5. Fixing rod, 6. Conical sleeve, 7. Fixing ring, 8. Perforation, 9. Lower ring pipe, 10. Lower nozzle, 11. Heating medium pipeline, 12. Heater, 13. First circulation pump, 14. Circulation pipeline, 15. Steam pipeline, 16. Suction pump, 17. Heat exchanger, 18. Condenser, 19. Outlet pipeline, 20. Upper nozzle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Example 1: Refer to Figures 1-2 As shown, an energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater includes a flash tower 1. A liquid outlet pipeline 19 is fixedly connected to the lower end of the flash tower 1, and a steam pipeline 15 is fixedly connected to the upper end of the flash tower 1. A suction pump 16 is installed on the steam pipeline 15. The device is characterized in that the steam pipeline 15 is connected to the shell side of a heat exchanger 17. A spray assembly is fixedly installed inside the upper end of the flash tower 1. A liquid inlet pipeline 2 is connected to the spray assembly, and a booster pump 3 is installed on the liquid inlet pipeline 2. The liquid inlet pipeline 2 is connected to the tube side of the heat exchanger 17. The spray assembly is fixed inside a conical sleeve 6, the diameter of the upper end of the conical sleeve 6 being larger than the diameter of the lower end. The conical sleeve 6 is fixed inside the flash tower 1. The lower part of the conical sleeve 6 is fixed in the inner hole of a fixing ring 7. Multiple through holes 8 are evenly distributed around the circumference of the fixing ring 7, and the through holes 8 are close to the conical sleeve 6.

[0024] The spray assembly is shaped like an inverted pagoda and includes multiple circular distributors 4. The diameter of the distributors 4 decreases from top to bottom. The distributors 4 are concentric and interconnected. Multiple upper nozzles 20 are evenly distributed and fixedly connected to the outer edge of each distributor 4. The outlet end of each upper nozzle 20 faces the inner wall of the conical sleeve 6. A fixing rod 5 is fixed to the uppermost distributor 4 and is fixed inside the conical sleeve 6. The liquid inlet line 2 is connected to the uppermost distributor 4.

[0025] The sidewall of the cone sleeve 6 is hollow, and the inner cavity of the sidewall of the cone sleeve 6 is connected to the heating medium pipeline 11. A heater 12 is installed on the heating medium pipeline 11, and a second circulation pump is built into the heater 12. The heating medium pipeline 11 is partially arranged in a serpentine pattern inside the lower end of the flash tower 1. A lower ring pipe 9 is fixed inside the flash tower 1 below the cone sleeve 6. Multiple lower nozzles 10 are fixedly connected to the upper end of the lower ring pipe 9. A circulation pipeline 14 connects the lower end of the flash tower 1 and the lower ring pipe 9. A first circulation pump 13 is installed on the circulation pipeline 14.

[0026] When this device is in operation, the suction pump 16 is started, and the flash tower 1 is under negative pressure.

[0027] Heater 12 and its built-in second circulation pump are started. The heating medium is heated by heater 12 and flows in the inner cavity of heating medium pipeline 11 and the side wall of cone sleeve 6. The heating medium can heat the mother liquor in the lower end of flash tower 1. After the water in the mother liquor evaporates, it is discharged through steam pipeline 15 and flows through the shell side of heat exchanger 17.

[0028] The first circulation pump 13 is started, which causes the heated mother liquor to enter the lower ring pipe 9 and then be atomized and sprayed out from the lower nozzle 10. The atomization and spraying out of the lower nozzle 10 can increase the evaporation area and thus improve the evaporation efficiency of the water in the mother liquor.

[0029] The booster pump 3 is started. The mother liquor in the inlet pipeline 2 flows through the tube side of the heat exchanger 17 and exchanges heat with the water vapor flowing through the shell side of the heat exchanger 17. The water vapor flowing through the shell side of the heat exchanger 17 can preheat the mother liquor flowing through the tube side of the heat exchanger 17. The preheated mother liquor is atomized and sprayed out from multiple upper nozzles 20. The mother liquor atomized from the upper nozzles 20 comes into contact with the inner wall of the cone sleeve 6 and is reheated. The water in the mother liquor atomized from the upper nozzles 20 evaporates inside the cone sleeve 6. Using the water vapor in the steam pipeline 15 to preheat the mother liquor entering the flash evaporator 1 can realize the recovery and utilization of the waste heat of the water vapor, while reducing the heat consumption of the heating medium and reducing the energy consumption of the heater 12.

[0030] When the water vapor below the fixed ring 7 rises, it passes through the perforation 8. After passing through the perforation 8, the water vapor can contact the outer wall of the cone sleeve 6, which can ensure the temperature of the water vapor during its upward movement in the flash tower 1 and prevent the water vapor from cooling down and condensing during its upward movement in the flash tower 1, thereby improving the evaporation efficiency of water in the mother liquor.

[0031] After the water in the mother liquor at the lower end of the flash tower 1 evaporates, the mother liquor is discharged from the outlet pipe 19.

[0032] Example 2: Based on Example 1, referring to... Figure 1 As shown, the shell side of heat exchanger 17 is connected to the shell side of condenser 18, and cooling water flows through the tube side of condenser 18.

[0033] The water vapor used to preheat the mother liquor is condensed in condenser 18 and then discharged.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater, comprising a flash tower (1), a liquid outlet pipeline (19) fixedly connected to the lower end of the flash tower (1), a steam pipeline (15) fixedly connected to the upper end of the flash tower (1), and a suction pump (16) installed on the steam pipeline (15), characterized in that, The steam pipeline (15) is connected to the shell side of the heat exchanger (17). A spray assembly is fixed inside the upper end of the flash tower (1). The liquid inlet pipeline (2) is connected to the spray assembly. A booster pump (3) is installed on the liquid inlet pipeline (2). The liquid inlet pipeline (2) is connected to the tube side of the heat exchanger (17). The spray assembly is fixed inside the conical sleeve (6). The conical sleeve (6) is fixed inside the flash tower (1). The side wall of the conical sleeve (6) is hollow. The inner cavity of the side wall of the conical sleeve (6) is connected to the heating medium pipe. The line (11) is connected, and a heater (12) is installed on the heating medium pipeline (11). The heating medium pipeline (11) is arranged in a serpentine pattern at the lower end of the flash tower (1). A lower ring pipe (9) is fixed in the flash tower (1) below the cone sleeve (6). Multiple lower nozzles (10) are fixedly connected to the upper end of the lower ring pipe (9). The circulation pipeline (14) connects the lower end of the flash tower (1) and the lower ring pipe (9). A first circulation pump (13) is installed on the circulation pipeline (14).

2. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 1, characterized in that, The shell side of the heat exchanger (17) is connected to the shell side of the condenser (18), and the cooling water flows through the tube side of the condenser (18).

3. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 1, characterized in that, The diameter of the upper end of the cone sleeve (6) is larger than the diameter of the lower end.

4. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 3, characterized in that, The spray assembly is shaped like an inverted pagoda. The spray assembly includes multiple circular distributors (4). The diameter of the multiple circular distributors (4) decreases from top to bottom. The multiple distributors (4) are concentric and interconnected. Multiple upper nozzles (20) are evenly distributed and fixedly connected to the outer edge of the distributors (4). The outlet end of the upper nozzle (20) faces the inner wall of the cone sleeve (6).

5. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 3, characterized in that, A fixing rod (5) is fixed on the uppermost distributor (4). The fixing rod (5) is fixed inside the cone sleeve (6). The liquid inlet line (2) is connected to the uppermost distributor (4).

6. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 1, characterized in that, The lower part of the cone sleeve (6) is fixed in the inner hole of the fixing ring (7). Multiple through holes (8) are evenly distributed around the circumference of the fixing ring (7), and the through holes (8) are close to the cone sleeve (6).

7. The energy-saving vacuum flash evaporation and dehydration device for high-salt wastewater according to claim 1, characterized in that, The heater (12) has a built-in second circulation pump.

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