A wastewater treatment device based on the principle of saturated air water-carrying recondensation separation

Abstract

The utility model provides a kind of wastewater treatment device based on saturated air water-carrying recondensation extraction separation principle, including air water tower, gas condensate extraction tower and fan, fan is connected with the air inlet of air water tower, the air outlet of air water tower is connected with the air inlet of gas condensate extraction tower by conveying gas pipeline, same elevation connecting gas pipeline is also set between air water tower and gas condensate extraction tower, valve is installed on connecting gas pipeline to adjust the switch and flow size of connecting gas pipeline, so by connecting air communication pipe at the tower body same height of air water tower and gas condensate extraction tower, the pressure difference between the two towers can be effectively prevented too large, play the role of pressure balance and airflow stability, prevent fan "surge", protect device structure;While can play the flow regulation and buffer when working condition fluctuation, such technical scheme guarantees the stability and efficiency of device operation, and improves the flexibility and safety of device operation, is energy-saving optimization measure.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater treatment device based on the principle of saturated air-carrying water re-coagulation separation. Background Technology

[0002] With industrial development and population growth, wastewater discharge has increased year by year, posing a serious threat to water resources and the environment. The demand for wastewater treatment is high, and commonly used wastewater treatment technologies include distillation, membrane separation, low-temperature flue gas concentration, adsorption, and biological treatment. Meanwhile, in recent years, wastewater treatment technologies based on the water-carrying characteristics of air have received increasing attention due to their advantages such as low energy consumption and simple operation. These technologies utilize the significant differences in saturated humidity of air at different temperatures; high-temperature air can carry more moisture, which condenses and separates after cooling.

[0003] Based on the separation technology of air carrying water, existing wastewater treatment devices use humidification towers, dehumidification towers, and fans to convert wastewater into fresh water. High-temperature wastewater enters the humidification tower, and the fan provides blowing air to the humidification tower. After the wastewater and air are mixed, water-saturated air is formed and enters the dehumidification tower through the air outlet at the top of the humidification tower through the pipeline using the pressure difference between the two towers. The water-saturated air condenses into fresh water in the dehumidification tower, thus converting wastewater into fresh water.

[0004] While the humidification and dehumidification towers are designed with safe theoretical pressure differential values, the applicant has discovered that excessive pressure differentials can occur in actual operation, leading to the following problems: 1. Overload of the fans causing "surging" and shutdown; 2. Overpressure in the humidification tower causing cracks in the spray system interfaces and bulging of the tower body; 3. Excessive negative pressure in the dehumidification tower causing deformation and collapse, or air backflow; 4. Risks of tower vibration and interface leaks. Troubleshooting requires inspecting each component and pipeline individually, which is not only inefficient but also extremely labor-intensive. All of these factors severely impact the normal operation of the entire wastewater treatment system.

[0005] There is an urgent need for a wastewater treatment device based on the principle of saturated air-carrying water re-coagulation separation to prevent the problem of excessive pressure difference between the two towers. Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model proposes a wastewater treatment device based on the principle of saturated air-carrying water re-coagulation separation, the solution of which is as follows: A wastewater treatment device based on the principle of saturated air-carrying water re-coagulation and separation includes a device body, which includes an air-drawing water filling tower, an air-condensing water extraction tower, and a blower. The blower is connected to the air inlet of the air-drawing water filling tower, and the air outlet of the air-drawing water filling tower is connected to the air inlet of the air-condensing water extraction tower through a gas delivery pipeline. A connecting gas pipeline at the same elevation is also provided between the air-drawing water filling tower and the air-condensing water extraction tower. A valve is installed on the connecting gas pipeline to adjust the opening and closing of the connecting gas pipeline and the flow rate.

[0007] Furthermore, the gas-water extraction tower is equipped with two packing layers, and the port connecting the gas pipeline to the gas-water extraction tower is located between the two packing layers; the gas-water condensation tower is equipped with multiple layers of vortex condensation discs, and the port connecting the gas pipeline to the gas-water extraction tower is located between two layers of vortex condensation discs.

[0008] Furthermore, the two packing layers are located between the upper water inlet and the bottom water outlet of the gas-water filling tower, and the air inlet of the gas-water filling tower is located below the two packing layers, while the air outlet is located at the top of the tower body.

[0009] Furthermore, the packing layer uses honeycomb ceramic packing or polypropylene stepped ring packing, with a specific surface area of ​​150-300 m² / m³.

[0010] Furthermore, the multi-layer vortex condensation plate is located between the upper water inlet and the bottom water outlet of the gas condensation water extraction tower, the air inlet of the gas condensation water extraction tower is located below the multi-layer vortex condensation plate, and the air outlet of the gas condensation water extraction tower is located at the top of the tower body.

[0011] Furthermore, the device body also includes an air-suction water extraction pump, an air-condensation water extraction pump, an air-suction heater, and an air-condensation cooler; an external wastewater source is connected to the air-condensation water extraction pump through a pipeline, the air-condensation water extraction pump is connected to the air-suction heater through a pipeline, the air-suction heater is connected to the spray-type inlet at the top of the air-suction water extraction tower through a pipeline, and the outlet at the bottom of the air-suction water extraction tower is connected to the air-condensation water extraction pump, thus forming a wastewater circulation path. A concentrated water discharge branch pipeline is also branched off from the pipeline located between the air-condensation water extraction pump and the air-suction heater; the outlet at the bottom of the air-suction water extraction tower is connected to the air-condensation water extraction pump through a pipeline, the air-condensation water extraction pump is connected to the air-condensation cooler through a pipeline, and the air-condensation cooler is connected to the inlet at the top of the air-suction water extraction tower through a pipeline, thus forming a fresh water circulation path. A fresh water discharge branch pipeline is also branched off from the pipeline located between the air-condensation cooler and the inlet water.

[0012] Furthermore, an air-suction preheater is also connected to the external wastewater pipeline and the pipeline connected to the outlet at the bottom of the air-suction water tower.

[0013] Furthermore, the gas-heated heater is an electric heater or a steam heat exchanger, and its heating temperature can be adjusted within a range of 50-120℃.

[0014] Furthermore, the condenser is a shell-and-tube heat exchanger or a plate heat exchanger, and its cooling medium is cooling water or chilled brine, with an adjustable cooling temperature range of 5-30℃.

[0015] Compared with the prior art, the advantages of this utility model are as follows: This wastewater treatment device connects an air-suction water filling tower and an air-condensation water extraction tower at the same height. Valves are installed on the air-suction water filling tower to control the air supply and flow rate. This effectively prevents excessive pressure difference between the two towers, achieving pressure balance and airflow stability, preventing fan "surge," and protecting the device structure. Simultaneously, it can regulate and buffer flow rate during fluctuations in operating conditions. This technical solution ensures the stability and efficiency of the device's operation while improving its flexibility and safety, representing an energy-saving optimization measure.

[0016] The wastewater treatment device of this invention improves the internal structure of the air-drawing water filling tower and the air-condensing water extraction tower, and connects an air connecting pipe at the same height in the tower bodies of the air-drawing water filling tower and the air-condensing water extraction tower, thereby improving the separation effect and efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the wastewater treatment device according to an embodiment of the present invention.

[0018] In the above figures: 1. Gas-drawing water filling tower; 11. Lower packing layer; 12. Upper packing layer; 2. Gas-condensing water extraction tower; 21. Four-layer vortex condensation disc; 3. Gas-drawing blower; 4. Connecting gas pipeline; 41. First port; 42. Second port; 5. Gas-drawing preheater; 6. Gas-drawing heater; 7. Gas-drawing water filling pump; 8. Gas-condensing water extraction pump; 9. Gas-condensing cooler; 10. Gas delivery pipeline. Detailed Implementation

[0019] To facilitate understanding of this utility model by those skilled in the art, the specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, this utility model proposes a wastewater treatment device based on the principle of saturated air-carrying water re-condensation and separation, including an air-suction water filling tower 1, an air-condensation water extraction tower 2, an air-suction blower 3, an air-condensation cooler 9, an air-suction preheater 5, an air-suction heater 6, an air-suction water filling pump 7, an air-condensation water extraction pump 8, a connecting air pipeline 4, and a conveying air pipeline 10. The blower is connected to the air inlet of the air-suction water filling tower 1, and the air outlet of the air-suction water filling tower 1 is connected to the air inlet of the air-condensation water extraction tower 2 through the conveying air pipeline 10. The air-suction water filling tower 1 and the air-condensation water extraction tower 2 are connected by a connecting air pipeline 4 at the same elevation, and a valve is installed on the connecting air pipeline 4 to adjust the opening and closing and flow rate of the connecting air pipeline 4.

[0021] The above technologies can effectively prevent excessive pressure difference between the two towers, achieving pressure balance and airflow stability, preventing fan "surge," and protecting the equipment structure. At the same time, they can regulate and buffer flow during fluctuations in operating conditions. This technical solution not only ensures the stability and efficiency of the equipment operation but also improves the flexibility and safety of the equipment operation, making it an energy-saving optimization measure.

[0022] like Figure 1 As shown, a certain amount of wastewater is stored in the gas-water extraction tower 1, and a certain amount of fresh water is stored in the gas-water condensation tower 2.

[0023] like Figure 1 As shown in the figure, the dashed lines represent the ventilation pipes, such as the connecting air pipe 4 and the air delivery pipe 10.

[0024] The air inlet of the air-drawing water extraction tower 1 is connected to the air outlet of the air-drawing blower 3 via a pipe. The cold side inlet of the air-drawing preheater 5 is connected to an external wastewater source, and the hot side inlet of the air-drawing preheater 5 is connected to the fresh water discharged from the bottom outlet of the air-condensing water extraction tower 2. This configuration of the air-drawing preheater 5 allows for heat exchange between the lower-temperature wastewater and the higher-temperature fresh water at the bottom of the air-condensing water extraction tower 2, preheating the wastewater while simultaneously cooling the fresh water. This fully utilizes the system's energy, achieving excellent waste heat utilization and energy saving.

[0025] The gas-pump heater 6 is installed on the pipeline between the gas-pump water pump 7 and the gas-pump water tower 1. In this embodiment, the gas-pump heater 6 is a steam heat exchanger, but an electric heater can also be used, and the heating temperature is set to 80°C~95°C.

[0026] It should be noted that, for ease of description, the port connecting the gas pipeline 4 to the gas-water intake tower 1 is named the first port 41, and the port connecting the gas pipeline 4 to the gas-water intake tower 1 is named the second port 42.

[0027] The air-to-water filling tower 1 has two packing layers inside, which effectively increase the contact area between wastewater and air. For easy distinction, the two packing layers are named upper packing layer 12 and lower packing layer 11, respectively. In this embodiment, both upper packing layer 12 and lower packing layer 11 are made of polypropylene stepped ring packing with a specific surface area of ​​200 m² / m³. Upper packing layer 12 is located between the upper water inlet and the first pipe opening 41 of air-to-water filling tower 1, and lower packing layer 11 is located between the first pipe opening 41 and the bottom water outlet. The air inlet of air-to-water filling tower 1 is located below lower packing layer 11, and the air outlet is located above upper packing layer 12, at the top of the tower body.

[0028] The first port 41 of the gas pipeline 4 is located between the two packing layers, which can optimize the gas-liquid contact path, balance the system pressure and humidity gradient, and improve mass transfer efficiency to achieve the process goal.

[0029] The bottom outlet of the air-suction water filling tower 1 is connected to the inlet of the air-suction water filling pump 7 through a pipe. The outlet pipe of the air-suction water filling pump 7 is connected to the air-suction heater 6. After heating, the water is returned to the upper inlet of the air-suction water filling tower 1 to form a wastewater circulation path. This can prolong the residence time of wastewater in the air-suction water filling tower 1 and enhance the gas-liquid mass transfer effect.

[0030] The outlet of the gas-drawing water extraction tower 1 is connected to the inlet of the gas-condensing water extraction tower 2 through the gas delivery pipeline 10.

[0031] In this embodiment, the condenser cooler 9 is a plate heat exchanger, or a shell and tube heat exchanger. The condenser cooler 9 is installed on the outlet pipe of the condenser water extraction pump 8. The cooling medium is cooling water, and the cooling temperature is set to 20℃~30℃.

[0032] To efficiently separate and discharge the removed water and avoid secondary entrainment, the aerosol condensation water extraction tower 2 is equipped with multiple layers of vortex condensation discs. In this embodiment, four layers of vortex condensation discs 21 are selected as an example. The upper two layers of vortex condensation discs are located between the upper water inlet and the second pipe 42 of the aerosol condensation water extraction tower 2, and the lower two layers of vortex condensation discs are located between the second pipe 42 and the bottom water outlet. The air inlet of the aerosol condensation water extraction tower 2 is located below the lower two layers of vortex condensation discs, and the air outlet is located above the upper two layers of vortex condensation discs and at the top of the tower body. The air outlet is used for gas discharge.

[0033] The second port 42 of the gas pipeline 4 is set between two layers of vortex condensation plates. This placement of the gas pipeline between the two water collection plates is not a simple location choice, but rather a solution based on the core logic of segmented treatment from coarse dehumidification to fine dehumidification. By implementing boundary isolation, dual liquid removal, uniform airflow distribution, and segmented liquid control, it solves four key problems: interference in the treatment section, secondary entrainment, overflow, and energy waste. Its ultimate goal is to ensure the long-term stable operation of the gas condensation water extraction tower and reduce overall costs.

[0034] The bottom freshwater outlet of the aerosol extraction tower 2 is connected to the inlet of the aerosol extraction pump 8 through a pipe. The outlet of the aerosol extraction pump 8 is connected to the aerosol cooler 9 through a pipe. The aerosol cooler 9 is connected to the freshwater inlet at the top of the aerosol extraction tower 1 through a pipe, thus forming a freshwater circulation path. The purified freshwater is connected to the freshwater discharge pipeline through a branch pipe from the outlet of the aerosol extraction pump 8.

[0035] The working process of this embodiment is as follows: Connecting the gas pipeline 4: According to the actual working conditions, open the valve on the connecting pipeline and adjust the valve flow rate; Air-carrying water process: After the wastewater enters the wastewater treatment device, it first passes through the air-drawing preheater 5 to exchange heat with fresh water (preheating the wastewater while cooling the fresh water, making full use of the energy of the system to achieve energy saving). Then it mixes with the air-drawing circulating wastewater drawn from the bottom of the air-drawing water tower 1 by the air-drawing water pump 7, and then passes through the air-drawing heater 6, where the wastewater temperature rises to 80℃~95℃. The heated wastewater enters the air-drawing water tower 1 from the top of the air-drawing water tower 1 by spraying, and passes downward through the upper packing layer 12. At the same time, the air-drawing fan 3 introduces air into the pipeline and sends it to the bottom of the air-drawing water tower 1. The air inside the tower flows upward through the lower packing layer 11. The liquid and gas phases are in countercurrent contact. The air temperature rises and the water humidity is saturated. The wastewater is concentrated because some of the fresh water is carried away by the air in the form of water vapor. After multiple cycles, the wastewater concentration increases to near saturation to form concentrated water. This concentrated water is discharged through the pipeline branch located between the air-drawing water pump 8 and the air-drawing heater 6. Condensation and separation process: Fresh water at the bottom of the aerosol extraction tower 2 is pumped into the air preheater 5 by the aerosol extraction pump 8 to preheat the raw wastewater and cool it down. Then, it is cooled to 20℃~30℃ by the aerosol cooler 9. The cooled fresh water enters from the top of the aerosol extraction tower 2. At the same time, saturated air carrying water enters the air inlet at the bottom of the aerosol extraction tower 2 from the air outlet of the air intake tower 1. After the liquid and gas phases flow through the multi-stage vortex condensation plate and come into counter-current contact, the hot air carrying water cools down, and the moisture in the air decreases due to the saturation humidity. The liquid water is condensed and separated and collected at the bottom of the aerosol extraction tower 2. Finally, it is transported to the fresh water discharge pipeline by the aerosol extraction pump 8 and then enters the subsequent fresh water collection process.

[0036] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A wastewater treatment device based on the principle of saturated air-carrying water re-coagulation separation, comprising a device body, characterized in that, The main body of the device includes a gas-drawing water filling tower (1), a gas-condensing water extraction tower (2), and a blower. The blower is connected to the air inlet of the gas-drawing water filling tower (1). The air outlet of the gas-drawing water filling tower (1) is connected to the air inlet of the gas-condensing water extraction tower (2) through a gas delivery pipeline (10). A connecting gas pipeline (4) at the same elevation is also provided between the gas-drawing water filling tower (1) and the gas-condensing water extraction tower (2). A valve is installed on the connecting gas pipeline (4) to adjust the opening and closing of the connecting gas pipeline (4) and the flow rate.

2. The wastewater treatment device according to claim 1, characterized in that, The gas-water extraction tower (1) is equipped with two packing layers, and the port of the gas pipeline (4) connecting the gas-water extraction tower (1) is located between the two packing layers; the gas-water extraction tower (2) is equipped with multiple layers of vortex condensation plates, and the port of the gas pipeline (4) connecting the gas-water extraction tower (1) is located between two layers of vortex condensation plates.

3. The wastewater treatment device according to claim 2, characterized in that, Two packing layers are located between the upper water inlet and the bottom water outlet of the gas-water filling tower (1), and the air inlet of the gas-water filling tower (1) is located below the two packing layers, and the air outlet is located at the top of the tower body.

4. The wastewater treatment apparatus according to claim 2 or 3, characterized in that, The packing layer uses honeycomb ceramic packing or polypropylene stepped ring packing, with a specific surface area of ​​150-300 m² / m³.

5. The wastewater treatment device according to claim 2, characterized in that, The multi-layer vortex condensation plate is located between the upper water inlet and the bottom water outlet of the gas condensation water extraction tower (2). The air inlet of the gas condensation water extraction tower (2) is located below the multi-layer vortex condensation plate, and the air outlet of the gas condensation water extraction tower (2) is located at the top of the tower body.

6. The wastewater treatment device according to claim 1, characterized in that, The device body also includes an air-drawing water pump (7), an air-condensing water extraction pump (8), an air-drawing heater (6), and an air-condensing cooler (9); an external wastewater source is connected to the air-condensing water extraction pump (8) through a pipe, the air-condensing water extraction pump (8) is connected to the air-drawing heater (6) through a pipe, the air-drawing heater (6) is connected to the spray-type inlet at the top of the air-drawing water extraction tower (1) through a pipe, and the outlet at the bottom of the air-drawing water extraction tower (1) is connected to the air-condensing water extraction pump (8), thereby forming a wastewater circulation path, located in A concentrated water discharge branch pipe is also branched off from the pipeline between the condensate extraction pump (8) and the gas-suction heater (6); the outlet at the bottom of the gas-suction water filling tower (1) is connected to the condensate extraction pump (8) through a pipeline, the condensate extraction pump (8) is connected to the condensate cooler (9) through a pipeline, and the condensate cooler (9) is connected to the inlet at the top of the gas-suction water filling tower (1) through a pipeline, thus forming a fresh water circulation path. A fresh water discharge branch pipe is also branched off from the pipeline between the condensate cooler (9) and the inlet water.

7. The wastewater treatment apparatus according to claim 6, characterized in that, An air-suction preheater (5) is also connected to the external wastewater pipeline and the pipeline connected to the outlet at the bottom of the air-suction water filling tower (1).

8. The wastewater treatment apparatus according to claim 6, characterized in that, The gas-heating heater (6) is an electric heater or a steam heat exchanger, and its heating temperature can be adjusted within a range of 50-120℃.

9. The wastewater treatment apparatus according to claim 6, characterized in that, The condenser (9) is a shell-and-tube heat exchanger or a plate heat exchanger, and its cooling medium is cooling water or chilled brine. The cooling temperature can be adjusted within the range of 5-30℃.

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