Double-rotation microbubble demulsification device for oily wastewater

Abstract

The present invention relates to the field of sewage treatment technology, and specifically to a double-swirl microbubble demulsification device for oily wastewater, comprising a straight cylindrical cavity, a cyclone cavity and a splitting cavity connected in sequence from bottom to top, the side wall of the straight cylindrical cavity is provided with a water inlet along the tangential direction, a sewage outlet is provided at the bottom, an air inlet pipe is provided inside the straight cylindrical cavity that penetrates from the outside, an air outlet is provided on the air inlet pipe, the air outlet has the same air flow rotation direction as the water flow rotation direction of the water inlet, multiple layers of cutting columns are distributed on the side wall of the splitting cavity, the number of cutting columns in each layer is multiple, and the upper end of the splitting cavity is the water outlet. In this application, the oily wastewater and gas undergo a strong cyclonic motion in the cyclone cavity, and finally the oily wastewater and gas enter the splitting cavity, and the mixture of the oily wastewater and gas is guided and cut by the cutting column, and finally the oily wastewater is demulsified, and the emulsified oil is converted into floating oil. The device can be used as a pretreatment facility for an oil removal process unit, and can greatly improve the efficiency of subsequent oil removal process units.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a double-rotation microbubble demulsification device for oily wastewater. Background Art

[0002] Rapid economic development has resulted in the generation of large quantities of oily wastewater from oil extraction, processing, and mechanical engineering. This has created numerous obstacles to industrial production and poses significant environmental hazards, seriously threatening the health and well-being of animals, plants, and even humans. Oily wastewater poses significant risks not only to plants, animals, and the environment, but also to human life and health. Oily wastewater, characterized by its large volume, complex water quality, and resistance to biodegradation, severely contaminates plants, soil, and water bodies upon entry into the natural environment, making it widely considered a difficult-to-treat industrial wastewater. Currently, floating oil, acting as a barrier, blocks oxygen from dissolving in the water, resulting in the suffocation of numerous aquatic plants and animals and hindering photosynthesis. This impacts the ecological balance and the water's natural purification processes, deteriorating water quality, and harming the ecosystem. Furthermore, toxic and hazardous substances are ingested by fish and shellfish, potentially harming human health through the food chain.

[0003] In addition, under the background of strict implementation of my country's environmental protection policies, the development and utilization of water resources has certain strategic significance and value. The oily wastewater generated by industry is a waste of water resources. Proper treatment of oily wastewater not only makes effective use of water resources, but also reduces the discharge of sewage, which is also of certain significance to the protection of the ecological environment.

[0004] The source, composition, and form of oily wastewater are the primary factors affecting its treatment difficulty. Treatment methods can be broadly categorized into four categories: physical methods, primarily centrifugal separation, coarse granulation, and membrane separation; chemical methods, primarily chemical oxidation and photochemical separation; physical and chemical methods, primarily flotation, adsorption, and magnetic adsorption separation; and biochemical methods, primarily activated sludge and biofilm separation. Currently, comprehensive research on oily wastewater treatment has yielded numerous proven methods, which are now being applied in real-world production and are continually being developed and innovated.

[0005] Based on the diameter of the oil particles, oily wastewater can be divided into four categories: floating oil, dispersed oil, emulsified oil, and dissolved oil. Floating oil, with the largest diameter, is generally larger than 100 μm and forms a layer of oil, which can be figuratively called a grease film. It can be separated by utilizing the density difference between oil and water and using a grease trap. Dispersed oil, with particles generally ranging from 10 to 100 μm in diameter, is suspended in the water as tiny droplets. Due to its unstable nature, it typically transforms into floating oil after a period of stasis. Under certain circumstances, it can also transform into dissolved oil. Emulsified oil, with particles less than 10 μm in diameter, is stable and more difficult to separate. Dissolved oil, with particles generally less than 0.1 μm in size, exists as molecules and is stable. Due to the low solubility of oil in water, the proportion of dissolved oil is generally less than 0.5%. Emulsified oil, due to the inherent properties of the oil droplets and the mutual repulsion between them, maintains its stability over time. Therefore, removing emulsified oil from oily wastewater is both a difficult and key issue in treatment technology. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned problems and shortcomings and provide a double-spin microbubble demulsification device for oily wastewater. In the straight cylindrical cavity, the oily wastewater and gas can form a double helix upward trend. In the cyclone cavity, the oily wastewater and gas perform a strong cyclonic motion inside, and the gas gradually moves toward the center, so that the gas and oily wastewater are gradually mixed from the inside to the outside, and the gas plays an adhesion role, which has a demulsification effect. Finally, the oily wastewater and gas enter the dividing cavity, and the cutting column guides and cuts the mixture of oily wastewater and gas, and cuts the gas into smaller units, further enhancing the adhesion effect of the gas. At the same time, the double-spin upward motion of the oily wastewater and gas itself can also play a demulsification role. Finally, the oily wastewater is demulsified through the coupling of the above-mentioned multiple effects, and the emulsified oil is converted into floating oil. The device can be used as a pretreatment facility for the oil removal process unit, which can greatly improve the efficiency of the subsequent oil removal process unit.

[0007] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is:

[0008] A double-cyclonic microbubble demulsification device for oily wastewater comprises a straight cylindrical cavity, a cyclonic cavity and a splitting cavity which are sequentially connected from bottom to top; a water inlet is arranged on the side wall of the straight cylindrical cavity in a tangential direction, a sewage outlet is provided at the lower part, an air inlet pipe is provided inside the straight cylindrical cavity which penetrates from the outside, an air outlet is provided on the air inlet pipe, the air flow rotation direction of the air outlet is the same as the water flow rotation direction of the water inlet, multiple layers of cutting columns are distributed on the side wall of the splitting cavity, and the number of cutting columns on each layer is multiple, and the upper end of the splitting cavity is a water outlet.

[0009] Furthermore, in the above-mentioned double-rotation microbubble demulsification device for oily wastewater, the air inlet pipe includes a straight pipe section and a curved pipe section, the axis of the straight pipe section intersects perpendicularly with the axis of the straight cylindrical cavity, and the straight pipe section is provided with two nozzles symmetrically distributed at 180°. The nozzles are located on the end side wall of the straight pipe section, one end of the curved pipe section is connected to the middle part of the straight pipe section, and the other end passes through the side wall of the straight cylindrical cavity.

[0010] Furthermore, in the above-mentioned double-spin microbubble demulsification device for oily wastewater, the curved pipe section is composed of two straight pipes connected by an elbow.

[0011] Furthermore, in the above-mentioned double-spin microbubble demulsification device for oily wastewater, the end of the straight pipe section is fixedly connected to the inner wall of the straight cylindrical cavity.

[0012] Furthermore, in the above-mentioned double-swirl microbubble demulsification device for oily wastewater, the nozzle is a tapered nozzle.

[0013] Furthermore, in the above-mentioned double-swirl microbubble demulsification device for oily wastewater, the axis of the nozzle is perpendicular to the axis of the straight pipe section.

[0014] Furthermore, in the above-mentioned double-rotation microbubble demulsification device for oily wastewater, the segmentation chamber is alternately arranged with a single-layer gyro-guided cutting column and a double-layer gyro-guided cutting column, the single-layer gyro-guided cutting column includes a connecting column and a gyro head arranged at the outer end of the connecting column, the double-layer gyro-guided cutting column includes a connecting column, a circle of conical protrusions arranged on the connecting column and a gyro head arranged at the outer end of the connecting column, the inner end of the connecting column is fixedly connected to the inner wall of the segmentation chamber, the inner end of the gyro head is set to a frustum shape extending from the connecting column to the outer end, and the outer end is set to a cone shape extending from the center to the inner end, and the size of the gyro head of the single-layer gyro-guided cutting column is larger than the size of the gyro head of the double-layer gyro-guided cutting column.

[0015] Furthermore, in the above-mentioned double-rotation microbubble demulsification device for oily wastewater, the conical outer end of the gyro head of the single-layer gyro guide cutting column is circumferentially provided with an inward concave arc, and the circumferential direction of its frustum-shaped inner end is provided with an outward convex arc; the conical outer end of the double-layer gyro guide cutting column is circumferentially provided with an inward concave arc, and the circumferential direction of its frustum-shaped inner end is provided with an outward convex arc, and the outer and inner ends of its conical protrusion are circumferentially provided with outward convex arcs.

[0016] Furthermore, in the above-mentioned double-swirl microbubble demulsification device for oily wastewater, the position of the water inlet is lower than the position of the air inlet.

[0017] Furthermore, in the above-mentioned double-cyclone microbubble demulsification device for oily wastewater, the upper main body of the straight cylindrical cavity is cylindrical, and the lower part is in an inverted cone shape. The straight cylindrical cavity is supported by several bases connected to its outside; the cyclone cavity is in a cone shape, and the dividing cavity is cylindrical.

[0018] The beneficial effects of the double-rotation microbubble demulsification device for oily wastewater of the present invention are as follows:

[0019] The double-swirl microbubble demulsification device of the present invention arranges a water inlet in a tangential direction on the side wall of a straight cylindrical cavity, and sets two nozzle structures symmetrically distributed at 180 degrees inside the straight cylindrical cavity. After the gas is injected, the oily wastewater can form a double helix upward trend, forming a suction effect on the oily wastewater. Then, the oily wastewater and the gas enter the cyclone cavity, causing the oily wastewater and the gas to perform a strong cyclonic motion inside, and the gas gradually moves toward the center, so that the gas and the oily wastewater are gradually mixed from the inside to the outside, and the gas plays an adhesive role, achieving a demulsification effect. Finally, the oily wastewater and gas enter the segmentation chamber, and the cutting column guides and cuts the mixture of oily wastewater and gas, cutting the gas into smaller units, further enhancing the adhesion of the gas. At the same time, the double spiral upward movement of the oily wastewater and gas in the cyclone chamber and the segmentation chamber can also play a demulsification role. Finally, through the coupling of the above multiple effects, the oily wastewater is demulsified, and the emulsified oil is converted into floating oil. The device can be used as a pretreatment facility for the oil removal process unit, which can greatly improve the efficiency of the subsequent oil removal process unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a double-rotation microbubble demulsification device for oily wastewater according to an embodiment of the present invention.

[0021] Figure 2 2 is a schematic diagram of the main structure of a double-rotation microbubble demulsification device for oily wastewater according to an embodiment of the present invention.

[0022] Figure 3 yes Figure 2 Schematic diagram of BB cross-sectional structure.

[0023] Figure 4 2. It is a schematic diagram of the right side structure of a double-rotation microbubble demulsification device for oily wastewater according to an embodiment of the present invention.

[0024] Figure 5 yes Figure 4 AA cross-sectional structural diagram.

[0025] Figure 6 This is one of the structural schematic diagrams of a single-layer gyro-guided cutting column according to an embodiment of the present invention.

[0026] Figure 7This is one of the structural schematic diagrams of a double-layer gyro-guided cutting column according to an embodiment of the present invention.

[0027] Figure 8 This is the second structural schematic diagram of a single-layer gyro-guided cutting column according to an embodiment of the present invention.

[0028] Figure 9 This is the second structural schematic diagram of the double-layer gyro-guided cutting column according to an embodiment of the present invention.

[0029] In the figure: 1 is a single-layer gyro-guided cutting column, 1-1 is a connecting column, 1-2 is a gyro head, 2 is a double-layer gyro-guided cutting column, 2-1 is a connecting column, 2-2 is a conical protrusion, 2-3 is a gyro head, 3 is a dividing chamber, 4 is a swirl chamber, 5 is a straight cylinder chamber, 6 is an air inlet pipe, 6-1 is a straight pipe section, 6-2 is a curved pipe section, 6-3 is a nozzle, 7 is a water inlet, 8 is an air inlet, 9 is a sewage outlet, 10 is a base, and 11 is a water outlet. DETAILED DESCRIPTION

[0030] The following is a more detailed description of a double-rotation microbubble demulsification device for oily wastewater of the present invention with reference to the accompanying drawings and through specific embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] See also Figure 1-Figure 2This embodiment discloses a double-cyclonic microbubble demulsification device for oily wastewater, comprising a straight cylindrical cavity, a cyclonic cavity and a dividing cavity connected in sequence from bottom to top, a water inlet arranged on the side wall of the straight cylindrical cavity in a tangential direction, a sewage outlet provided at the lower part, an air inlet pipe penetrating from the outside provided inside the straight cylindrical cavity, an air outlet provided on the air inlet pipe, the air flow rotation direction of the air outlet is the same as the water flow rotation direction of the water inlet, multiple layers of cutting columns are distributed on the side wall of the dividing cavity, and the number of cutting columns on each layer is multiple, and the upper end of the dividing cavity is the water outlet. When the device of the present application is used, oily wastewater is first injected from the water inlet, and then gas is injected from the air inlet pipe, which can cause the oily wastewater to form a double helix upward trend, forming a suction effect on the oily wastewater. Then, the oily wastewater and gas enter the cyclone chamber, causing the oily wastewater and gas to perform a strong cyclonic motion inside, and the gas gradually moves toward the center, so that the gas and oily wastewater are gradually mixed from the inside to the outside, and the gas plays an adhesion role, which has a demulsification effect. Finally, the oily wastewater and gas enter the segmentation chamber, and the cutting column guides and cuts the mixture of oily wastewater and gas, further enhancing the adhesion effect of the gas. At the same time, the double helix upward motion of the oily wastewater and gas in the cyclone chamber and the segmentation chamber itself can also play a demulsification role. Finally, through the coupling of the above multiple effects, the oily wastewater is demulsified, and the emulsified oil is converted into floating oil. The device can be used as a pretreatment facility for the oil removal process unit, which can greatly improve the efficiency of the subsequent oil removal process unit. The treated oily wastewater is discharged from the water outlet at the top of the segmentation chamber.

[0033] In this embodiment, the air inlet conduit preferably includes a straight pipe section and a curved pipe section. The axis of the straight pipe section intersects perpendicularly with the axis of the straight cylindrical cavity. The straight pipe section is provided with two nozzles symmetrically distributed at 180°. The arrangement of the two nozzles can increase the rotational kinetic energy of the airflow. The nozzles are located on the sidewalls of the end of the straight pipe section, enabling the gas to be ejected from near the sidewall of the straight cylindrical cavity, thereby more evenly mixing with the water flow. One end of the curved pipe section is connected to the middle of the straight pipe section, and the other end passes through the sidewall of the straight cylindrical cavity. Specifically, the curved pipe section is composed of two straight pipes connected by an elbow. The end of the curved pipe section that passes through the straight cylindrical cavity is provided with a connecting flange to facilitate connection to an external air source.

[0034] In this embodiment, preferably, the end of the straight pipe section is fixedly connected to the inner wall of the straight cylindrical cavity, so as to facilitate the fixation of the air intake pipeline.

[0035] In this embodiment, preferably, the nozzle is a tapered nozzle, which can play a throttling role, increase the speed of the gas when it is ejected, and make the rotational power of the gas stronger. More preferably, the axis of the nozzle is perpendicular to the axis of the straight pipe section, so that the gas can enter roughly along the tangential direction of the straight cylinder cavity, facilitating the formation of a vortex.

[0036] In this embodiment, preferably, the segmentation chamber is alternately arranged with single-layer gyro-guided cutting columns and double-layer gyro-guided cutting columns. The single-layer gyro-guided cutting columns include a connecting column and a gyro head disposed at the outer end of the connecting column. The double-layer gyro-guided cutting columns include a connecting column, a circle of conical protrusions disposed on the connecting column, and a gyro head disposed at the outer end of the connecting column. The inner end of the connecting column is fixedly connected to the inner wall of the segmentation chamber. The inner end of the gyro head is configured as a frustum extending from the connecting column to the outer end, while the outer end is configured as a cone extending from the center to the inner end. The gyro head of the single-layer gyro-guided cutting column is larger than the gyro head of the double-layer gyro-guided cutting column. Alternating single-layer gyro-guided cutting columns and double-layer gyro-guided cutting columns of different sizes within the segmentation chamber can enhance the segmentation effect within the segmentation chamber, disperse the gas into smaller pieces, enhance adhesion, and thus achieve a better demulsification effect. In other embodiments, optimal oil removal can also be achieved by varying the specific form and number of cutting columns.

[0037] In this embodiment, preferably, the conical outer end of the gyro head of the single-layer gyro guide cutting column is circumferentially provided with an inward concave arc, and the circumferential direction of its frustum-shaped inner end is provided with an outward convex arc; the conical outer end of the double-layer gyro guide cutting column is circumferentially provided with an inward concave arc, and the circumferential direction of its frustum-shaped inner end is provided with an outward convex arc, and the outer end and inner end of its conical protrusion are circumferentially provided with an outward convex arc. Setting the gyro head and the conical protrusion surface to an arc shape can make the direction of the fluid flowing therethrough change more, further promote the mixing of various fluids, and thus better play a demulsification role. The use of an arc transition between the conical protrusion and the gyro head of the double-layer gyro guide cutting column can enhance the connection strength.

[0038] In this embodiment, preferably, the position of the water inlet is lower than that of the air inlet, so that the oily wastewater has formed a single spiral upward foundation, which facilitates the formation of a double spiral upward trend through the vortex of the gas.

[0039] In this embodiment, preferably, the upper body of the straight-cylindrical cavity is cylindrical and the lower part is in an inverted cone shape, which is convenient for sewage discharge from the sewage outlet. The straight-cylindrical cavity is supported by several bases connected to its outside; the vortex cavity is in a cone shape, which has a throttling effect on the fluid, facilitating the full mixing of gas and oily wastewater, and the dividing cavity is cylindrical.

[0040] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the invention belongs. The use of "first", "second" and similar words in the specification and claims of this application does not indicate any order, quantity or importance, but is only used to distinguish different components. Similarly, the use of "one" or "an" and similar words does not necessarily indicate a quantitative limitation. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0041] The exemplary embodiments of the present invention are described in detail above with reference to preferred embodiments. However, it will be understood by those skilled in the art that, without departing from the concept of the present invention, various variations and modifications may be made to the above-mentioned specific embodiments, and various combinations of the various technical features and structures proposed in the present invention may be made without exceeding the scope of protection of the present invention.

Claims

1. A double-rotation microbubble demulsification device for oily wastewater, characterized in that: It includes a straight cylindrical cavity, a swirl cavity and a segmentation cavity that are sequentially connected from bottom to top. The side wall of the straight cylindrical cavity is provided with a water inlet in the tangential direction, and a sewage outlet is provided at the bottom. An air inlet pipe is provided inside the straight cylindrical cavity and penetrates from the outside. An air outlet is provided on the air inlet pipe. The air flow rotation direction of the air outlet is the same as the water flow rotation direction of the water inlet. Multiple layers of cutting columns are distributed on the side wall of the segmentation cavity, and the number of cutting columns on each layer is multiple. The upper end of the segmentation cavity is a water outlet. The air intake pipeline includes a straight pipe section and a curved pipe section. The axis of the straight pipe section intersects perpendicularly with the axis of the straight cylindrical cavity. The straight pipe section is provided with two nozzles symmetrically distributed at 180 degrees. The nozzles are located on the end sidewalls of the straight pipe section. One end of the curved pipe section is connected to the middle of the straight pipe section, and the other end passes through the sidewall of the straight cylindrical cavity. The nozzles are tapered nozzles, and the axis of the nozzles is perpendicular to the axis of the straight pipe section. The split cavity is alternately arranged with a single-layer gyro guide cutting column and a double-layer gyro guide cutting column. The single-layer gyro guide cutting column includes a connecting column and a gyro head arranged at the outer end of the connecting column. The double-layer gyro guide cutting column includes a connecting column, a circle of conical protrusions arranged on the connecting column and a gyro head arranged at the outer end of the connecting column. The inner end of the connecting column is fixedly connected to the inner wall of the split cavity. The inner end of the gyro head is set to be a frustum extending from the connecting column to the outer end, and the outer end is set to be a cone extending from the center to the inner end. The gyro head of the single-layer gyro guide cutting column has a larger size than that of the double-layer gyro guide cutting column; the conical outer end of the gyro head of the single-layer gyro guide cutting column is provided with an inwardly concave arc in the circumference, and the truncated cone inner end is provided with an outwardly convex arc in the circumference; the conical outer end of the double-layer gyro guide cutting column is provided with an inwardly concave arc in the circumference, and the truncated cone inner end is provided with an outwardly convex arc in the circumference, and the outer and inner ends of the conical convex are provided with outwardly convex arcs in the circumference; The position of the water inlet is lower than that of the air inlet; The upper body of the straight-cylindrical cavity is cylindrical, and the lower body is in an inverted frustum shape. The straight-cylindrical cavity is supported by a plurality of bases connected to the outside thereof; the swirl cavity is in a frustum shape, and the segmentation cavity is in a cylindrical shape.

2. A double-rotation microbubble demulsification device for oily wastewater according to claim 1, characterized in that: The bent pipe section is composed of two straight pipes connected by an elbow.

3. The double-rotation microbubble demulsification device for oily wastewater according to claim 1, characterized in that: The end of the straight pipe section is fixedly connected to the inner wall of the straight cylindrical cavity.

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