Self-suction type rotational flow bubble generating device and wastewater treatment system

Abstract

The utility model discloses a self-suction type rotational flow bubble generating device and a wastewater treatment system, relates to the field of chemical wastewater recycling, in particular to recycling of ozone tail gas in the technology of removing organic matters in wastewater through catalytic ozonation, and particularly relates to the self-suction type rotational flow bubble generating device and the wastewater treatment system. Comprising a hollow rotational flow shell, the upper portion of the rotational flow shell is cylindrical, and the lower portion of the rotational flow shell is conical; the upper part of the rotational flow shell is fixedly connected with a water inlet pipe and extends into the rotational flow shell along the tangential direction of the rotational flow shell; according to the three-dimensional swirling turbulent flow device, the structure is simple, the upper portion of the swirling flow shell is cylindrical, the lower portion of the swirling flow shell is conical, the water inlet pipe is horizontally arranged and extends into the swirling flow shell in the tangential direction of the swirling flow shell, after fluid enters the swirling flow shell, negative pressure is formed in the swirling flow shell, external air is sucked into the swirling flow shell, and gas is induced to oscillate in a three-dimensional swirling turbulent flow field; and the crushing holes and the reaction collision net are utilized to realize crushing and strengthen gas-liquid mixing.

Description

Technical Field

[0001] The utility model relates to the field of chemical wastewater resource utilization, specifically to the recovery and utilization of ozone tail gas in the technology of ozone catalytic oxidation for removing organic matter in wastewater, and particularly to a self-priming cyclone bubble generator and a wastewater treatment system. Background Art

[0002] Chemical wastewater treatment is to deeply remove suspended impurities, hardness ions, organic matter, etc. in the wastewater to achieve reuse. The application of ozone catalytic oxidation technology in wastewater treatment for removing organic matter is quite common. However, in the prior art, the low solubility of ozone in water results in low utilization rate during use, and a large ozone tail gas destruction system is required, and some effective ozone is lost during the process, resulting in useless loss of ozone and increasing the cost of wastewater treatment.

[0003] In view of the problems of large ozone oxidation tail gas treatment volume, high energy consumption, low ozone utilization rate, and imperfect system in the ozone oxidation device, it is urgent to develop a gas-liquid mixing device for improving ozone utilization to enhance the efficiency of the ozone catalytic oxidation process.

[0004] CN 216472421 U discloses an ozone catalytic reaction device, which uses hydraulic jet mixing to achieve gas-liquid mixing and an external forced circulation system for tail gas recovery and utilization; however, this method requires the configuration of special pumps and equipment, greatly increasing the construction cost and not being suitable for popularization in engineering construction.

[0005] CN 107029571 A discloses a gas-liquid two-phase mixing device, including a gas delivery pipeline, a liquid delivery pipeline, a gas-liquid mixing unit, and a gas-liquid mixing output pipeline; however, when this device mixes gas and liquid, both gas and liquid need to have a certain power. For conventional ozone tail gas, additional pipelines and equipment need to be added to achieve the mixing reaction, and the economic benefits are poor.

[0006] CN 103111033 A discloses a self-priming cyclone bubble generator, including a mixing chamber for realizing gas-liquid mixing. The mixing chamber is a hollow cylinder. One side of the cylinder is a liquid inlet, and the other side is a liquid outlet. The side wall of the cylinder of the mixing chamber has a gas inlet, and a cyclone generating device composed of baffles is arranged at the joint of the mixing chamber and the liquid inlet; however, the inlet and outlet of this device are horizontally symmetrically arranged, the cyclone intensity is low, and the negative pressure on the gas is insufficient, resulting in a reduction in reaction efficiency.

[0007] CN 116589074 A discloses a weak cyclone bubble separator that can generate a large number of micro-nano bubbles, generate a large number of hydroxyl radicals under the regulation of pH and ionic strength environment, and strengthen the degradation of organic pollutants. However, the separator of the device is a weak cyclone, the fluid rotation speed is slow, the generated bubbles are easy to break when encountering the liquid level control valve, and the oxidation reaction efficiency is low. Summary of the Utility Model

[0008] To solve the above problems, the utility model provides a self - sucking type swirling bubble generating device and a wastewater treatment system, which can induce gas to oscillate and break in a three - dimensional rotating turbulent flow field, strengthen gas - liquid mixing, form gas self - suction - breaking - mixing, and achieve the purposes of reducing the treatment load of the tail gas at the back end of ozone oxidation, improving the ozone utilization rate, and reducing energy consumption.

[0009] A self - sucking type swirling bubble generating device of the utility model includes a hollow swirling housing. The upper part of the swirling housing is cylindrical, and the lower part is conical.

[0010] A water inlet pipe for fluid to enter is fixedly connected to the upper part of the swirling housing. The water inlet pipe is horizontally arranged and extends into the swirling housing tangentially along the swirling housing.

[0011] It also includes an air inlet pipe for forming a negative pressure in the swirling housing after the fluid enters the swirling housing to suck external air into the swirling housing. An air suction port is arranged at the top of the swirling housing. One end of the air inlet pipe is hermetically inserted into the swirling housing from the air suction port. The end of the air inlet pipe inserted into the swirling housing is located in the upper part of the swirling housing and the end is blocked.

[0012] A cylindrical reaction collision net is sleeved on the air inlet pipe. Breaking holes are evenly distributed in the area of the air inlet pipe corresponding to the reaction collision net. The reaction collision net is made of gas - loving and water - repellent materials and water - loving and gas - repellent materials.

[0013] An aeration outlet is arranged at the bottom of the swirling housing.

[0014] Preferably, the taper of the conical section of the housing is 0.125 - 0.5.

[0015] A self - sucking type swirling bubble generating method uses a self - sucking type swirling bubble generating device for gas - liquid mixing. The specific method is as follows:

[0016] When the wastewater containing organic matter enters the swirling housing along the tangential direction of the swirling housing through the water inlet pipe, it generates a rotating motion and flows towards the aeration outlet. During this process, due to the action of centrifugal force, the liquid is thrown towards the inner wall of the swirling housing and descends along the inner wall to the aeration outlet at the bottom. The lighter fluid moves towards the center of the swirling housing and rises. During the rotation of the fluid, shear force is generated due to the friction between different velocity layers. The shear force causes the rotation speed of the fluid to gradually decrease from the outside to the inside. At the center of the swirling housing, a low - pressure area is formed due to the velocity difference, so that external gas is sucked into the swirling housing from the air inlet pipe and flows together with the fluid.

[0017] The gas enters the reactor through the fragmentation holes. The fragmentation holes perform a primary cutting and fragmentation on the gas, forming micro-bubbles. Then, it flows through the collision reaction net and moves linearly on the woven net. The fragmented micro-bubbles collide and come into contact with the wastewater at the contact surface of the woven intersections. By means of linear wire drawing, the surface energy of the gas-liquid contact is reduced, the contact surface between the two is increased, and thus the effective oxidation of pollutants can be enhanced.

[0018] A wastewater treatment system includes a self-priming vortex bubble generating device and a catalytic oxidation tower. A discharge port is provided at the top of the catalytic oxidation tower, and one end of the air inlet pipe extending out of the vortex housing is connected to the discharge port.

[0019] The water inlet pipe is connected to the water outlet provided at the upper part of the catalytic oxidation tower through a circulation pump, and the aeration outlet is connected to the oxidation inlet provided at the lower part of the catalytic oxidation tower through a water injector.

[0020] A wastewater inlet is further provided at the lower part of the catalytic oxidation tower, and the wastewater inlet is connected to an oxidation tower water inlet pipe through a water inlet pump.

[0021] An air inlet is provided on the water injector, and the air inlet is connected to an ozone source through a pipeline.

[0022] A wastewater treatment system includes a self-priming vortex bubble generating device and a catalytic oxidation tower. A discharge port is provided at the top of the catalytic oxidation tower, a water outlet is provided at the upper part of the catalytic oxidation tower, and a wastewater inlet and an oxidation inlet are provided at the lower part of the catalytic oxidation tower.

[0023] The water inlet pipe is connected to an oxidation tower water inlet pipe through a water inlet pump, the aeration outlet is connected to the wastewater inlet, one end of the air inlet pipe extending out of the vortex housing is connected to the discharge port, the water inlet is connected to a water injector through a circulation pump, the water injector is connected to the oxidation inlet, an air inlet is provided on the water injector, and the air inlet is connected to an ozone source through a pipeline.

[0024] The structure of the present utility model is simple. The upper part of the vortex housing is cylindrical, the lower part of the vortex housing is conical, the water inlet pipe is horizontally arranged and extends into the vortex housing tangentially along the vortex housing. After the fluid enters the vortex housing, a negative pressure is formed in the vortex housing to suck external air into the vortex housing, inducing the gas to oscillate in a three-dimensional rotating turbulent flow field, and realizing fragmentation by using the fragmentation holes and the reaction collision net, strengthening the gas-liquid mixing.

[0025] The present utility model reuses the waste gas oxidized by ozone, and a self-priming vortex bubble generating device realizes gas-liquid mixing by relying on the self-power of the influent or the return effluent.

[0026] The utility model generates a large number of bubbles with small sizes, which is beneficial to gas-liquid mixing. A self-priming vortex bubble generating device not only reduces the treatment load of the ozone destruction system at the rear end, but also improves the effective oxidation pretreatment of organic matter in the wastewater at the front end. The ozone reuse rate in the ozone catalytic oxidation of the exhaust gas is higher than 60%, and the gas-liquid ratio is higher than 1:5.

[0027] The utility model can flexibly add a vortex bubble generator on the ozone catalytic oxidation process route to recover and utilize the ozone tail gas. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of a self-priming vortex bubble generating device.

[0029] Figure 2 It is a schematic diagram of the air inlet pipe.

[0030] Figure 3 It is a schematic diagram of the unfolded reaction collision net.

[0031] Figure 4 It is a schematic diagram of the connection relationship of a wastewater treatment system.

[0032] Figure 5 It is a schematic diagram of the connection relationship of another wastewater treatment system.

[0033] Reference numerals: 1 - vortex housing, 2 - air inlet pipe, 3 - collision reaction net, 4 - catalytic oxidation tower, 5 - water inlet pump, 6 - circulation pump, 7 - water injector, 8 - a self-priming vortex bubble generating device. Detailed Embodiments

[0034] A self-priming vortex bubble generating device 8 of the utility model includes a hollow vortex housing 1. The upper part of the vortex housing 1 is cylindrical, and the lower part of the vortex housing 1 is conical;

[0035] The upper part of the vortex housing 1 is fixedly connected with an air inlet pipe for the fluid to enter. The air inlet pipe is horizontally arranged and extends into the vortex housing 1 along the tangential direction of the vortex housing 1;

[0036] It also includes an air inlet pipe 2 for the fluid to enter the vortex housing 1 and form a negative pressure in the vortex housing 1 to suck external air into the vortex housing 1. An air suction port is arranged at the top of the vortex housing 1. One end of the air inlet pipe 2 is matched and sealed to extend into the vortex housing 1 from the air suction port. The end of the air inlet pipe 2 extending into the vortex housing 1 is located in the upper part of the vortex housing 1 and the end is blocked;

[0037] A cylindrical reaction collision net is also sleeved on the air inlet pipe 2. Crushing holes are evenly distributed on the area of the air inlet pipe 2 corresponding to the reaction collision net; The reaction collision net is made of a gas-philic and water-phobic material and a water-philic and gas-phobic material;

[0038] An aeration outlet is provided at the bottom of the cyclone housing 1.

[0039] The taper of the conical section of the housing is 0.125 - 0.5.

[0040] When the wastewater containing organic matter enters the cyclone housing 1 through the inlet pipe, it will be guided in the tangential direction to generate a rotational motion. This rotation is not just a simple circular motion but forms a spiral downward flow. During this process, due to the action of centrifugal force, the liquid will be thrown towards the inner wall of the cyclone housing 1 and descend along the wall to the bottom outlet, while the lighter fluid moves towards the center of the cyclone housing 1 and rises. During the rotation of the fluid, shear forces will be generated due to the friction between different velocity layers. These shear forces cause the rotational speed of the fluid to gradually decrease from the inner edge to the center of the cyclone housing 1. At the center of the cyclone housing 1, due to the significant velocity difference, a lower pressure zone is formed. As the velocity increases, the pressure at the center of the cyclone housing 1 will be lower than the surrounding air pressure. When this negative pressure reaches a certain level, it is sufficient to overcome the pressure difference and resistance in other parts of the system, and gas will be sucked in from the inlet pipe 2. These sucked-in gases will enter the cyclone housing 1 along with the fluid. When the gases enter the cyclone housing 1, the gas is cut and broken into micro-bubbles once by the breaking holes, and then flows through the collision reaction net 3 and enters the interior of the cyclone housing 1; the collision reaction net 3 is made of two materials, a gas-philic and water-hydrophobic material such as polytetrafluoroethylene and a water-philic and gas-hydrophobic material such as carbon-based material. It moves linearly on the woven net. The broken micro-bubbles collide and contact with the wastewater at the contact surface of the woven intersections. By linearly drawing the wire, the surface energy of the gas-liquid contact is reduced, and the contact surface of the two reactions is increased, thereby strengthening the effective oxidation of pollutants.

[0041] The self-priming cyclone bubble generating device 8 of the present utility model does not require external energy consumption. The process of gas-liquid mixing uses the inlet water or the circulating return water pump to pump into the inlet pipe and tangentially enters the combined cylindrical and conical cavity inside the cyclone housing 1 for high-speed spiral motion, and its tangential velocity can reach more than 5 m / s. A negative pressure is formed at the center of the cyclone field, and then external air or other gases are sucked into the interior of the cyclone housing 1 from the inlet pipe 2. The high-speed rotating liquid flow shears and breaks the sucked-in gas into a large number of small bubbles, and sprays out from the aeration outlet along with the liquid flow. An electromagnetic flowmeter is installed on the inlet pipeline to measure the water flow; a rotameter is installed on the air intake pipeline to measure the gas flow.

[0042] Example 1

[0043] The cyclone housing 1 with a nominal diameter of 50 mm, the height of the conical section is 400 mm, and the maximum inlet gas-liquid ratio is 0.85. As Figure 1As shown in the figure, the influent water tangentially enters the combined cavity of the inner cylinder and the cone in the swirl housing 1 and performs a high-speed spiral motion. Its tangential velocity can reach more than 5 m / s. A negative pressure is formed at the center of the swirl field, and then external air or other gases are sucked into the cavity from the air inlet. The high-speed rotating liquid flow shears and breaks the sucked gas into a large number of small bubbles, which are ejected from the aeration outlet along with the liquid flow.

[0044] A self-priming swirl bubble generator 8 with a designed nominal diameter of 300 mm under normal 75 m 3 / h working condition, the maximum air intake ratio can reach more than 15%, that is, 11.4 m3 / h, which can meet the requirements of engineering applications.

[0045] A self-priming swirl bubble generation method uses a self-priming swirl bubble generator 8 for gas-liquid mixing. The specific method is as follows:

[0046] When the wastewater containing organic matter enters the swirl housing 1 along the tangential direction of the swirl housing 1 through the water inlet pipe, it generates a rotational motion and flows towards the aeration outlet. During this process, due to the action of centrifugal force, the liquid is thrown towards the inner wall of the swirl housing 1 and descends along the inner wall to the aeration outlet at the bottom. The lighter fluid moves towards the center of the swirl housing 1 and rises. During the rotation of the fluid, shear force is generated due to the friction between different velocity layers. The shear force causes the rotational velocity of the fluid to gradually decrease from the outside to the inside. At the center of the swirl housing 1, a low-pressure area is formed due to the velocity difference, causing external gas to be sucked into the swirl housing 1 from the air inlet pipe 2 and flow along with the fluid;

[0047] The gas enters the reactor through the fragmentation holes. The fragmentation holes perform a primary cutting and fragmentation on the gas to form micro-bubbles, and then flow through the collision reaction net 3 and move linearly on the woven net. The fragmented micro-bubbles collide and contact with the wastewater at the contact surface of the woven intersections. By linearly drawing the wire, the surface energy of the gas-liquid contact is reduced, the contact surface between the two is increased, and thus the effective oxidation of pollutants can be enhanced.

[0048] The self-priming swirl bubble generator 8 of the present utility model can fully improve the utilization rate of ozone tail gas and realize the recycling of tail gas. A self-priming swirl bubble generator 8 uses the actions such as shear and collision of the flow field to break larger air cavities into micro-bubbles. The bubble production and energy efficiency are relatively high, the cost is low, and it has advantages in large-scale applications. By introducing a self-priming swirl bubble generator 8 into the ozone catalytic oxidation process, the ozone tail gas is cut into micro-bubbles and better mixed with the wastewater to exert a catalytic effect, improving the overall efficiency of ozone catalysis.

[0049] As Figure 4As shown in the figure, a wastewater treatment system includes a self-priming cyclone bubble generator 8 and a catalytic oxidation tower 4. A vent is provided at the top of the catalytic oxidation tower 4, and one end of the intake pipe 2 extending out of the cyclone housing 1 is connected to the vent.

[0050] The inlet pipe is connected to the water outlet provided at the upper part of the catalytic oxidation tower 4 through a circulation pump 6, and the aeration outlet is connected to the oxidation inlet provided at the lower part of the catalytic oxidation tower 4 through a water injector 7.

[0051] A wastewater inlet is also provided at the lower part of the catalytic oxidation tower 4, and the wastewater inlet is connected to an oxidation tower inlet pipe through a feed pump 5.

[0052] An air inlet is provided on the water injector 7, and the air inlet is connected to an ozone source through a pipeline.

[0053] The influent water enters the catalytic oxidation tower 4 through the feed pump 5, and evenly enters the catalyst packing layer through the water distribution device at the bottom layer of the oxidation tower. Part of the wastewater after the reaction passes through the water collection device provided at the upper layer and the variable-frequency circulation water pump outside, and the ozone tail gas is inhaled through a self-priming cyclone bubble generator 8. The wastewater is preliminarily oxidized by mixing with the ozone tail gas to complete the primary premixing, improving the utilization rate of the tail gas. After the pre-reaction, it is fully mixed with ozone through the water injector 7 and enters the catalytic oxidation tower 4 for catalytic reaction to achieve the removal of organic substances.

[0054] Pre-reaction is carried out before the wastewater enters the catalytic oxidation tower 4, and the tail gas can also be fully utilized. For example, Figure 5 As shown in the figure, a wastewater treatment system includes a self-priming cyclone bubble generator 8 and a catalytic oxidation tower 4. A vent is provided at the top of the catalytic oxidation tower 4, a water outlet is provided at the upper part of the catalytic oxidation tower 4, and a wastewater inlet and an oxidation inlet are provided at the lower part of the catalytic oxidation tower 4.

[0055] The inlet pipe is connected to an oxidation tower inlet pipe through a feed pump 5, the aeration outlet is connected to the wastewater inlet, one end of the intake pipe 2 extending out of the cyclone housing 1 is connected to the vent, the water inlet is connected to the water injector 7 through a circulation pump 6, the water injector 7 is connected to the oxidation inlet, an air inlet is provided on the water injector 7, and the air inlet is connected to an ozone source through a pipeline.

[0056] The ozone tail gas overflowing from the pipeline at the top of the catalytic oxidation tower 4 is preliminarily mixed with the influent water through a self-priming cyclone bubble generator 8, and after sufficient contact, it enters the bottom of the catalytic oxidation tower 4. Similarly, it evenly enters the catalyst packing layer through the water distribution device at the bottom layer of the oxidation tower for catalytic oxidation reaction to achieve the removal of organic substances.

[0057] Example 2

[0058] A certain coal chemical enterprise produces 100 m of concentrated brine through reverse osmosis concentration. 3 / h. The influent water quality of the high-salt wastewater COD removal treatment system is shown in Table 1. The ozone catalytic oxidation process section of this system is designed with four series of oxidizers operating in parallel, with each series having a treatment capacity of 25 m 3 / h, with a specification of diameter 3.4 × 7.5 m, 50% of the special catalyst loaded, and two sets of supporting ozone generators with a capacity of 20 kg / h, one in use and one in reserve. The removal rate of ozone oxidation is 40 - 50%, the ozone tail gas recovery rate is greater than 75%, and the SS of the produced water is less than 1 mg / L. The normal startup fully meets the process design indicators, ensuring high standards of sodium chloride and sodium sulfate produced in the subsequent salt separation process section. The project as a whole realizes zero discharge of wastewater and resource recovery of salt;

[0059] Table 1 Comparison of the application of the present utility model in a coal chemical project

[0060] Influent COD mg / L Effluent COD mg / L COD Removal Rate Ozone Tail Gas Utilization Rate Original Project 350~500 200~250 42~50% 0% After Installing Self-Priming Cyclone 350~500 180~230 48%~54% 75%

Claims

1. A self-priming cyclone bubble generating device, comprising a hollow cyclone housing, characterized in that, The upper part of the cyclone housing is cylindrical, and the lower part is conical; The upper part of the cyclone housing is fixedly connected with a water inlet pipe for the fluid to enter. The water inlet pipe is horizontally arranged and extends into the cyclone housing tangentially along the cyclone housing; It further includes an air inlet pipe for the fluid to form a negative pressure in the cyclone housing after entering the cyclone housing to suck external air into the cyclone housing. An air suction port is arranged at the top of the cyclone housing. One end of the air inlet pipe is hermetically inserted into the cyclone housing through the air suction port. The end of the air inlet pipe extending into the cyclone housing is located in the upper part of the cyclone housing and the end is blocked; A cylindrical reaction collision net is also sleeved on the air inlet pipe. Crushing holes are evenly distributed in the area of the air inlet pipe corresponding to the reaction collision net; The reaction collision net is made of an air-loving and water-repellent material and a water-loving and air-repellent material; An aeration outlet is arranged at the bottom of the cyclone housing.

2. The self-priming cyclone bubble generating device according to claim 1, wherein, The taper of the conical section of the housing is 0.125 - 0.

5.

3. A wastewater treatment system, characterized in that, It includes a self-priming cyclone bubble generating device and a catalytic oxidation tower as described in claim 1. A vent port is arranged at the top of the catalytic oxidation tower. One end of the air inlet pipe extending out of the cyclone housing is connected to the vent port; The water inlet pipe is connected to the water outlet arranged at the upper part of the catalytic oxidation tower through a circulation pump. The aeration outlet is connected to the oxidation inlet arranged at the lower part of the catalytic oxidation tower through a water injector; A wastewater inlet is further arranged at the lower part of the catalytic oxidation tower. The wastewater inlet is connected to an oxidation tower water inlet pipe through a water inlet pump; An air inlet is arranged on the water injector. The air inlet is connected to an ozone source through a pipeline; 4. A wastewater treatment system, characterized in that, It includes a self-priming cyclone bubble generating device and a catalytic oxidation tower as described in claim 1. A vent port is arranged at the top of the catalytic oxidation tower, a water outlet is arranged at the upper part of the catalytic oxidation tower, and a wastewater inlet and an oxidation inlet are arranged at the lower part of the catalytic oxidation tower; The water inlet pipe is connected to the oxidation tower water inlet pipe through a water inlet pump. The aeration outlet is connected to the wastewater inlet. One end of the air inlet pipe extending out of the cyclone housing is connected to the vent port. The water inlet is connected to the water injector through a circulation pump. The water injector is connected to the oxidation inlet. An air inlet is arranged on the water injector. The air inlet is connected to an ozone source through a pipeline.

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