Electromagnetic composite field high-efficiency treatment process equipment for oily sewage

Abstract

The paper presents a kind of electromagnetic composite field efficient treatment of oily wastewater process equipment, using multi-section variable frequency electric field layout; electric, magnetic field, flow field drive combination of oily wastewater removal of innovative technology, can effectively recover the trace oil components of emulsified oil wastewater; multi-field drive can effectively improve the effect of oily wastewater treatment, especially for O / W emulsion. Through electrophoresis, shock coalescence, electromagnetic drive to improve the strength and ability of automatic floating coalescence, greatly reduce the reaction time; the process and system equipment improve the oil recovery efficiency of oily wastewater, reduce the environmental pollution and environmental governance cost, at the same time, improve the economic benefit; belongs to the field of energy environmental protection equipment and petrochemical environmental protection.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oily wastewater treatment process equipment, and particularly relates to a process equipment for efficiently treating oily wastewater in an electromagnetic composite field. BACKGROUND

[0002] According to the existing form and the size of oil droplet particle diameter, the oil in wastewater can be divided into four types, i.e. floating oil, dispersed oil, emulsified oil and dissolved oil, and the content is generally between several tens of milligrams to tens of thousands of milligrams per liter, and the distribution range of oil droplet particle diameter is also wide. At present, the methods used at home and abroad include physical methods such as membrane separation method, air flotation method, flocculation method and adsorption method, chemical methods such as demulsifier method, advanced oxidation method and electrochemical sacrificial anode method, and biological methods such as biological membrane method, activated sludge method and biological filter method. The above methods can treat oily wastewater, but due to the different forms of oil in wastewater, the treatment process of oily wastewater is also relatively complex. In addition, the above methods have problems such as large land occupation, low treatment efficiency and treatment capacity, high operation cost, poor environmental applicability and compatibility, and poor treatment efficiency for emulsified oil and dissolved oil. In addition, the most important thing is that the oil cannot be recovered, which causes great waste of resources.

[0003] Therefore, in view of the current places with trace amounts of O / W containing emulsified oil and dissolved oil and various problems existing at present, an electric-magnetic composite field high-efficiency demulsification process method and system equipment and application method are proposed, which aims to promote the recovery of oil resources, reduce environmental pollution, reduce the economic operation cost, and develop advanced high-efficiency resource recovery complete energy equipment, so as to contribute to the ecological environment protection, the health and safety of animals, plants and human beings. SUMMARY

[0004] In order to solve the above problems, the present application provides a kind of electromagnetic composite field efficient process equipment for treating oily wastewater, the main body of the equipment is vertical reaction tank body, the inside of reaction tank body is equipped with high-low frequency electromagnetic reaction component, the high-low frequency electromagnetic reaction component includes high frequency reactor and low frequency reactor, the high frequency reactor and low frequency reactor are symmetrically arranged in the inside of reaction tank body at upper and lower ends, high frequency reactor is arranged in the inside lower part of reaction tank body, low frequency reactor is arranged in the inside upper part of reaction tank body, high frequency reactor and low frequency reactor are equipped with middle water distributor, the bottom of low frequency reactor is equipped with bottom water distributor, the lower portion of bottom water distributor is equipped with hydraulic distribution pipe, the outside of high frequency reactor and low frequency reactor is equipped with electromagnetic generating device, the left side of high frequency reactor is equipped with S-pole magnetic field generating device, the right side of high frequency reactor is equipped with N-pole magnetic field generating device, the left side of low frequency reactor is equipped with N-pole magnetic field generating device, the right side of low frequency reactor is equipped with S-pole magnetic field generating device, the high frequency reactor and low frequency reactor are vertically and vertically equipped with a plurality of central electrode rods, the central electrode rods of high frequency reactor and the central electrode rods of low frequency reactor are vertically staggered, the inside of central electrode rod is equipped with a plurality of central electrodes, the outside of central electrode is equipped with hexagonal counter electrode, the central electrode and counter electrode are equipped with electrode gap, the central electrode is staggered with adjacent central electrode by hexagonal counter electrode, multi-section variable frequency electric field arrangement is adopted;The innovative technology of oil-containing wastewater removal driven by electric field, magnetic field and flow field can effectively recover trace oil components from emulsified oil-containing wastewater;Multi-field driving can effectively improve the treatment effect of oil-containing wastewater, especially for O / W emulsion. Through electrophoresis, shock coalescence and electromagnetic driving, the strength and capacity of automatic floating coalescence are improved, and the reaction time is greatly reduced. The process and system equipment improve the oil recovery efficiency of oil-containing wastewater, reduce the environmental pollution and environmental governance cost, and improve the economic benefit. It belongs to the field of energy environmental protection equipment and petrochemical environmental protection.

[0005] The shape of the reaction tank body is a vertical spherical end tank body, the center of the top end of the reaction tank body is provided with an exhaust valve group, the center of the bottom end of the reaction tank body is provided with a blowdown valve group, the upper end of the reaction tank body is provided with an oil layer, the lower side of the oil layer is provided with a water layer, the outer side of the oil layer is provided with an oil discharge valve group, the upper side of the water layer is provided with a water discharge valve group, the lower side of the water layer is provided with a high-low frequency electromagnetic reaction component, the bottom of the high-low frequency electromagnetic reaction component is provided with a water supply pump valve group, the present application can be used alone or cooperatively, has the advantages of small floor area, large treatment capacity, high treatment efficiency, low operation energy consumption, good environmental adaptability and system compatibility, and can be widely applied to different complex working conditions and external environments, is easy to install, and has low installation cost

[0006] The electromagnetic generating device is an external suspension type electromagnetic generating device, which comprises N-pole magnetic field generating devices and S-pole magnetic field generating devices, is arranged outside the reaction tank body in a ring-shaped outer package mode, and faces the inside of the reaction tank body.

[0007] The center electrode comprises a conductive core, a conductive anticorrosion layer and an insulation layer, the conductive core is in a cylindrical shape, the conductive anticorrosion layer is arranged outside the conductive core in a ring-shaped outer package mode, the conductive anticorrosion layer is in a cylindrical shape, the insulation layer is arranged outside the conductive anticorrosion layer in an outer package mode, the center electrode rods are vertically arranged and supported through arrangement supports, the arrangement supports comprise horizontal beam frames and vertical beam frames, a plurality of center electrode rods are arranged between the horizontal beam frames and the vertical beam frames, the horizontal beam frames are arranged at four corners in a rectangular frame mode and symmetrically and in parallel to each other, the horizontal beam frames comprise electrode top horizontal frames and electrode bottom horizontal frames, a plurality of vertical beam frames are arranged between the electrode top horizontal frames and the electrode bottom horizontal frames, the plurality of vertical beam frames are arranged in parallel and equidistant to each other, a plurality of vertical beam insertion holes are arranged on the surface of the vertical beam frames in a penetrating mode, the plurality of vertical beam insertion holes are arranged on the surface of the vertical beam frames in a collinear and equidistant mode, the center electrode rods are arranged inside the vertical beam insertion holes, the vertical beam insertion holes of adjacent vertical beam frames are arranged in a vertical equidistant staggered mode, the special electrode material form and arrangement form reduce the installation difficulty of the inner parts, effectively reduce the generation of invalid current, reduce the system energy consumption and the generation of harmful by-products, and make the electrode material have good chemical stability, thermal stability, oxidation resistance, good conductivity under gas, liquid and heat working conditions, significantly reduce the current release, improve the voltage strength, and the field strength is uniformly distributed, the vertical beam insertion holes are arranged between adjacent two vertical beam insertion holes, the included angle between the vertical beam insertion hole and the two vertical beam insertion holes on one side is b, the included angle between the vertical beam insertion hole and the two vertical beam insertion holes on the same horizontal line on the left and right sides is a, the angle range of a is 60-150°, the angle range of b is 30-150°, during the electric demulsification process, when the voltage is too high, the emulsion current increases, heating is serious, and electrolysis and electrode plate short circuit may occur; the electrode material and the special structure design can greatly improve the discharge voltage, reduce the current output, and effectively avoid the occurrence of the phenomenon.

[0008] The gap between the center electrode rod inside the high-frequency reactor and the low-frequency reactor is an electromagnetic reaction cavity, and the inside of the electromagnetic reaction cavity is provided with oily sewage, the oily sewage enters the inside of the reaction tank body through the filter screen, and the O / W containing sewage enters the reactor after filtration, and the filtration mesh number is 100-300 meshes, so as to remove larger solid particles.

[0009] The parameters of the high-frequency reactor are: electric field intensity: 200-1000 V / cm, electric field frequency: 100-1000 Hz, duty cycle: 30-100%, positive and negative output duty cycle: 50-100% (ratio of forward pulse to total pulse interval), magnetic field intensity: 0-2T, cross-sectional flow rate: 0.01-0.5 m / min, center electrode spacing (cm): 0-20 cm, and the parameters of the low-frequency reactor are: electric field intensity: 500-2000 V / cm, electric field frequency: 0-200 Hz, duty cycle: 30-90%, positive and negative output duty cycle: 50-100% (ratio of forward pulse to total pulse interval), magnetic field intensity: 1-2T, cross-sectional flow rate: 0.01-0.5 m / min, center electrode spacing (cm): 5-50 cm.

[0010] Advantages:

[0011] (1) The present application provides an electric and magnetic composite field high-efficiency demulsification process and system equipment, which is applied to the separation of oil and water in emulsified oily sewage, especially has excellent separation and treatment effect on O / W system in oil production industry and refining industry, and has wide application range.

[0012] (2) The equipment can be used alone or cooperatively, has the advantages of small occupied area, large treatment capacity, high treatment efficiency, low operation energy consumption, good environmental adaptability and system compatibility, and can be widely applied to different complex working conditions and external environments, is convenient to pry and install, and has low installation cost.

[0013] (3) The multi-section variable-frequency electric field, multi-section magnetic field and reactor flow field are coupled, the oil droplets are driven by the electric field and the magnetic Lorentz force, so that the fluid obtains the ability of eddy current electrophoresis and oscillation coalescence; at the same time, due to the large difference in charge property and quantity between the oil droplets and water, the acceleration obtained under the cooperative action of the electric and magnetic driving forces is different, at this time, the oil droplets increase the collision probability and combine into large oil droplets to float up, effectively reducing the transverse diffusion and return stage time, quickly forming stratification, and further obtaining higher O / W separation effect.

[0014] (4) The special electrode material form and arrangement form can reduce the installation difficulty of the inner part, effectively reduce the occurrence of invalid current, reduce the system energy consumption and the generation of harmful by-products, and make the electrode material have good chemical stability, thermal stability, oxidation resistance, good conductivity under gas, liquid and heat working conditions, significantly reduce the current release, improve the voltage strength, and the field strength distribution is uniform;

[0015] (5) In the electric demulsification process, when the voltage is too high, the emulsion current increases, the heat is serious, and the electrolysis and electrode plate short circuit may occur. The electrode material and special structure design can greatly improve the discharge voltage, reduce the current output, and effectively avoid the occurrence of the phenomenon.

[0016] (6) The reaction speed is fast, the quality of the separated oil layer is high, the reactor volume and the oil product post-processing difficulty are effectively reduced, and in addition, the device can be operated continuously with water, and the treatment capacity is large.

[0017] (7) The electrode material is simple and easy to obtain, and the processing is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a kind of internal section view of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0019] Figure 2 It is a kind of center electrode rod arrangement schematic diagram of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0020] Figure 3 It is a kind of center electrode rod arrangement local enlarged schematic diagram of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0021] Figure 4 It is a kind of center electrode and counter electrode combination structure diagram of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0022] Figure 5 It is a kind of center electrode rod internal combination schematic diagram of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0023] Figure 6 It is a kind of implementation example experiment comparison table of a process equipment for efficiently treating oily sewage by electromagnetic composite field.

[0024] Figure; 1, exhaust valve group, 2, oil layer, 3, drainage valve group, 4, N-pole magnetic field generating device, 5, external electromagnetic elimination partition, 6, S-pole magnetic field generating device, 7, bottom hydraulic distributor, 8, water pump valve assembly, 9, hydraulic uniform distribution pipe, 10, electrode bottom crossbar, 11, electromagnetic reaction cavity, 12, middle hydraulic distributor, 13, oil discharge valve group, 14, sewage valve group, 15, electrode top crossbar, 16, high-frequency reactor, 17, low-frequency reactor, 18, center electrode rod, 19, longitudinal beam frame, 20, center electrode, 21, counter electrode, 22, electrode gap. DETAILED DESCRIPTION

[0025] In order to deepen the understanding of the present application, the present application will be further described below in combination with examples and drawings, which are only used to explain the present application and do not constitute a limitation on the protection scope of the present application.

[0026] Exhaust valve group 1, oil layer 2, drainage valve group 3, N-pole magnetic field generating device 4, external electromagnetic elimination partition 5, S-pole magnetic field generating device 6, hydraulic distributor 7, water pump valve assembly 8, hydraulic uniform distribution pipe 9, electrode bottom crossbar 10, electromagnetic reaction cavity 11, secondary hydraulic distributor 12, oil discharge valve group 13, sewage valve group 14, electrode top crossbar 15, high-frequency reactor 16, low-frequency reactor 17, center electrode rod 18, longitudinal beam frame 19, center electrode 20, counter electrode 21, electrode gap 22.

[0027] As Figure 1 , 2 , 3, 4, 5, 6 are shown;

[0028] The utility model relates to a kind of electromagnetic composite field high-efficiency treatment oily sewage's process equipment, the main body of equipment is vertical reaction tank body, high-low frequency electromagnetic reaction component is equipped in the inside of reaction tank body, the high-low frequency electromagnetic reaction component includes high-frequency reactor 16 and low-frequency reactor 17, the high-frequency reactor 16 and low-frequency reactor 17 are symmetrically arranged in the inside upper and lower ends of reaction tank body in transverse midline, high-frequency reactor 16 is arranged in the inside lower portion of reaction tank body, low-frequency reactor 17 is arranged in the inside upper portion of reaction tank body, middle water distribution device 7 is arranged between high-frequency reactor 16 and low-frequency reactor 17, the bottom of low-frequency reactor 17 is equipped with bottom water distribution device 7, water distribution tube 9 is equipped below bottom water distribution device 7, electromagnetic generating device is equipped outside the reaction tank body of high-frequency reactor 16 and low-frequency reactor 17, S-pole magnetic field generating device 6 is equipped outside the left side of high-frequency reactor 16, N-pole magnetic field generating device 4 is equipped outside the right side of high-frequency reactor 16, N-pole magnetic field generating device 4 is equipped outside the left side of low-frequency reactor 17, S-pole magnetic field generating device 6 is equipped outside the right side of low-frequency reactor 17, high-frequency reactor 16 and low-frequency reactor 17 are vertically vertically equipped with several center electrode rods 18, the center electrode rod 18 of high-frequency reactor 16 and the center electrode rod 18 of low-frequency reactor 17 are vertically staggered, the inside of center electrode rod 18 is equipped with several center electrodes 20, the outside of center electrode 20 is equipped with hexagonal counter electrode 21, electrode gap 22 is arranged between center electrode 20 and counter electrode 21, center electrode 20 and adjacent center electrode 20 are arranged equidistantly and staggered by hexagonal counter electrode 21, the shape of reaction tank body is vertical spherical end tank body, exhaust valve group 1 is arranged in the center of top end of reaction tank body, blowdown valve group 14 is arranged in the center of bottom end of reaction tank body, oil layer 2 is arranged in the inside of upper end of reaction tank body, water layer is arranged below oil layer 2, oil outlet valve group 13 is arranged outside oil layer 2 and transversely, water outlet valve group 3 is arranged outside water layer and transversely, high-low frequency electromagnetic reaction component is arranged below water layer.The bottom of the high and low frequency electromagnetic reaction assembly is provided with a feed water pump valve assembly 8 between the upper part of the blowdown valve group 14, the electromagnetic generating device is an external suspension type electromagnetic generating device, the electromagnetic generating device includes N pole magnetic field generating device 4 and S pole magnetic field generating device 6, the electromagnetic generating device is annularly wrapped outside the reaction tank body, the electromagnetic generating device is all towards the inside of the reaction tank body, the adjacent end of the electromagnetic generating device is provided with an external electromagnetic elimination partition, the center electrode 20 includes a conductive core, a conductive anticorrosion layer and an insulating layer, the shape of the conductive core is cylindrical, the annular outside of the conductive core is wrapped with the conductive anticorrosion layer, the shape of the conductive anticorrosion layer is cylindrical, the outside of the conductive anticorrosion layer is wrapped with the insulating layer, the center electrode rod 18 is vertically arranged and supported by the arrangement support, the arrangement support includes a horizontal beam frame and a vertical beam frame 19, a plurality of center electrode rods 18 are arranged between the horizontal beam frame and the vertical beam frame 19, the horizontal beam frame is rectangularly framed and symmetrically and parallelly arranged at the four corners, the horizontal beam frame includes an electrode top crossbar 15 and an electrode bottom crossbar 10, a plurality of vertical beam frames 19 are arranged between the electrode top crossbar 15 and the electrode bottom crossbar 10, a plurality of the vertical beam frames 19 are arranged equidistantly and parallelly, a plurality of vertical beam insertion holes are arranged through the surface of the vertical beam frame 19, a plurality of the vertical beam insertion holes are arranged equidistantly and collinearly on the surface of the vertical beam frame 19, the inside of the vertical beam insertion hole is provided with the center electrode rod 18, the vertical beam insertion holes of the adjacent vertical beam frames 19 are arranged equidistantly and staggered, the vertical beam insertion hole is arranged between the adjacent two vertical beam insertion holes, the included angle of the center of the vertical beam insertion hole and the two adjacent vertical beam insertion holes on one side is b, the included angle of the center of the vertical beam insertion hole and the two adjacent vertical beam insertion holes on the same horizontal line on the left and right sides is a, the angle range of a is 60-150°, the angle range of b is 30-150°, the gap between the center electrode rods 18 inside the high frequency reactor 16 and the low frequency reactor 17 is the electromagnetic reaction cavity 11, the inside of the electromagnetic reaction cavity 11 is provided with oil-containing sewage, the oil-containing sewage enters the inside of the reaction tank body through the filter screen, the parameters of the high frequency reactor 16 are as follows: electric field intensity: 200-1000 V / cm, electric field frequency: 100-1000 Hz, duty cycle: 30-100%, positive and negative electrode output duty cycle: 50-100% (ratio of positive pulse to total pulse interval), magnetic field intensity: 0-2 T, cross-sectional flow rate: 0.01-0.5 m / min, center electrode 20 spacing (cm): 0-20 cm, the parameters of the low frequency reactor 17 are as follows: electric field intensity: 500-2000 V / cm, electric field frequency: 0-200 Hz, duty cycle: 30-90%, positive and negative electrode output duty cycle: 50-100% (ratio of positive pulse to total pulse interval), magnetic field intensity: 1-2 T, cross-sectional flow rate: 0.01-0.5 m / min, center electrode 20 spacing (cm): 5-50 cm.

[0029] Implementation example;

[0030] The O / W-containing sewage is filtered to remove large solid particles, and the filter mesh is 100-300 mesh;

[0031] The water is distributed through a pipe distributor and then through a hydraulic distributor 7 into a high-frequency reactor 16 for reaction; the main purpose of this reaction zone is to violently shake and coalesce and electrophoretic coalesce, magnetic force to accelerate collision coalescence and vortex formation, quickly break the phenomenon of O / W oil droplets not easy to separate due to the repulsion of the original oil droplet surface charge and steric effect.

[0032] The parameters of the high-frequency reactor 16 are set as follows:

[0033] Electric field strength: 200-1000 V / cm

[0034] Electric field frequency: 100-1000 Hz

[0035] Duty cycle: 30-100%

[0036] Positive and negative output ratio: 50-100% (ratio of positive pulse to total pulse)

[0037] Magnetic field strength: 0-2T

[0038] Cross-sectional flow rate: 0.01-0.5 m / min

[0039] Electrode angle: High-frequency reactor 16a: 60-150° b: 30-150°

[0040] Center electrode 20 spacing (cm): High-frequency reactor 16: 0-20 cm

[0041] After reaction in the high-frequency reactor 16, fine oil droplet particles coalesce into larger oil chains and oil droplets, and then enter the low-frequency reactor 17 through secondary water distribution. This area is to continue to increase the oil droplets and form larger oil chains, and under the action of magnetic field driving, they quickly accelerate and collide and combine into large oil droplets or oil chains from water. At the same time, due to the increase in charge after coalescence, they also accelerate under the action of the electric field and separate from the water phase, forming a mutually synergistic effect, and accumulating at the top and forming a continuous oil film. When the oil film reaches a certain thickness, it is discharged by the oil discharge valve group 13 (or enters the next stage of the process).

[0042] The parameters of the low-frequency reactor 17 are set as follows:

[0043] Electric field strength: 500-2000 V / cm

[0044] Electric field frequency: 0-200 Hz

[0045] Duty cycle: 30-90%

[0046] Positive and negative output ratio: 50-100% (ratio of positive pulse to total pulse range)

[0047] Magnetic field strength: 1-2T

[0048] Cross-sectional flow velocity: 0.01-0.5 m / min

[0049] Electrode angle:

[0050] Low-frequency reactor 17a: 60-150°C b: 30-150°C

[0051] Center electrode spacing (cm): Low-frequency reactor 17: 5-50cm

[0052] This equipment can be expanded in series or parallel according to actual site needs and emission requirements; at the same time, the obtained oil can be used in conjunction with our company's electric dehydration equipment to fully reduce the water content in the oil and thus obtain the required oil quality.

[0053] The electrode gap 22 between the two electrodes (10-200mm), wherein the counter electrode 21 is made of rolled sheet metal or woven mesh with anti-corrosion coating; and the center electrode 20 (5-50mm in diameter).

[0054] The magnetic fields in the upper and lower reaction zones (high-frequency reactor 16 and low-frequency reactor 17) should be perpendicular and opposite. The coupling effect between the electric and magnetic forces is beneficial for the removal of emulsified oil; and under the promoting effect of the magnetic force, the oil rises faster to form oil layer 2, directly impacting the oil film to form a thicker oil layer 2, effectively avoiding the stratification phenomenon between the oil film layer and the oil droplet layer, which would otherwise require a long floating time for the oil droplets to merge into oil layer 2.

[0055] Examples 1-5: -5# diesel oil was used. An appropriate amount of diesel oil (approximately 13 kg) and a demulsifier were added to tap water (1.0 m³), ​​stirred thoroughly to emulsify, and allowed to stand for 8 hours until no floating oil appeared (if any, remove it and continue stirring and emulsifying until no floating oil remains). The added demulsifier was 50 ppm / L. An appropriate amount of the emulsion was used for device parameter and performance testing. The central electrode 20 had a diameter of 30 mm, and the counter electrode 21 was a regular hexagonal hollow prism with an inscribed circle diameter of 100 mm. The thickness of the prism's stamped sheet was 1.0 mm.

[0056] Example 6: The emulsified oil-containing wastewater discharged from the machining cutting fluid was subjected to actual industrial test, and a special demulsifier for oil field was used, and the dosage was 50 ppm / L. An appropriate amount of emulsion was taken to test the device parameter conditions and performance, the center electrode 20 was 30 mm in diameter, the opposite electrode 21 was a regular hexagonal hollow prism with an inscribed circle diameter of 100 mm, and the thickness of the prism punched sheet was 1.0 mm.

[0057] Example 7: The emulsified oil-containing wastewater discharged from the electric dehydration device was subjected to actual industrial test, and a special demulsifier for oil field was used, and the dosage was 50 ppm / L. An appropriate amount of emulsion was taken to test the device parameter conditions and performance, the center electrode 20 was 30 mm in diameter, the opposite electrode 21 was a regular hexagonal hollow prism with an inscribed circle diameter of 100 mm, and the thickness of the prism punched sheet was 1.0 mm.

[0058] Example 8: The emulsified oil-containing wastewater discharged from the electric dehydration device was subjected to actual industrial test, and a special demulsifier for oil field was used, and the dosage was 50 ppm / L. An appropriate amount of emulsion was taken to test the device parameter conditions and performance, the center electrode 20 was 30 mm in diameter, the opposite electrode 21 was a regular hexagonal hollow prism with an inscribed circle diameter of 100 mm, and the thickness of the prism punched sheet was 1.0 mm.

[0059] a. The positive-to-negative output time ratio is the ratio of the positive pulse output time to the negative pulse output time in one output pulse cycle;

[0060] b. The turbidity of the oil-containing wastewater was determined by a turbidimeter (the emulsion turbidity was determined according to the national standard GB 13200-91, and the change of oil content before and after emulsion demulsification could reflect the effect of electric field demulsification);

[0061] c. The oil droplet size was determined by automatic counting and automatic calculation by an image acquisition system;

[0062] d. A multimeter was used to warn and check the current passing through the emulsion, and the minimum accuracy of the current was 1.0 mA, and the warning current was set to 100 mA;

[0063] e. A conductivity meter was used to measure the conductivity of the emulsion, and the measurement range was 0~1000 S / m;

[0064] f. The oil content in the O / W emulsion was determined according to the industry standard "Determination of Oil (Ultraviolet Spectrophotometry)" (SY / T5329-94);

[0065] From the data of the examples, it can be found that:

[0066] 1. The higher the emulsified oil concentration, the higher the oil content in the effluent, the larger the turbidity, and the higher the treatment efficiency;

[0067] 2. Based on the reaction results of the high-frequency reactor 16 and the low-frequency reactor 17 in the reaction zone, the high-frequency reactor 16 requires a higher frequency to promote oscillatory coalescence and electrophoretic coalescence, thereby rapidly forming oil chains; the low-frequency reactor 17 requires a lower frequency to lengthen the microscopic oil chain and promote the aggregation of oil droplets into large oil droplets; the coupling effect of electric force and magnetic force is beneficial to the removal of emulsified oil; and under the promotion of magnetic force, the oil layer 2 is formed by accelerated floating, directly impacting the oil film to form a thicker oil layer 2, effectively avoiding the stratification phenomenon between the oil film layer and the oil droplet layer, which takes a long time to merge into the oil layer 2.

[0068] 3. A duty cycle between 50% and 60% has a better processing effect. To maintain continuous electro-magnetic coupling, it is necessary to ensure that the positive and negative electrode time-to-output ratio is higher than 1. In addition, a larger magnetic intensity is beneficial to oil droplet separation and oil layer 2 formation, especially when the magnetic field strength of the low-frequency reactor 17 is greater than or equal to the magnetic field strength of the high-frequency reactor 16.

[0069] 5. The equipment has good environmental adaptability and stability. The leakage current of the center electrode 20 and the counter electrode 21 is extremely small, which effectively avoids the generation and accumulation of flammable and explosive gases released by leakage current.

[0070] 6. The spacing between the central electrodes 20 should be appropriate; too large or too small a distance will have an adverse effect on the separation effect. The angle of the central electrodes 20 is preferably 17:120° for low-frequency reactors and 16:90° for high-frequency reactors.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process equipment for efficiently treating oily sewage by electromagnetic composite field, the main body of the equipment is a vertical reaction tank body, a high-low frequency electromagnetic reaction assembly is arranged in the reaction tank body, characterized in that, The high-low frequency electromagnetic reaction assembly comprises a high-frequency reactor and a low-frequency reactor, which are symmetrically arranged at upper and lower ends of the inside of the reaction tank body, the high-frequency reactor is arranged at the lower part of the inside of the reaction tank body, the low-frequency reactor is arranged at the upper part of the inside of the reaction tank body, a middle hydraulic distributor is arranged between the high-frequency reactor and the low-frequency reactor, a bottom hydraulic distributor is arranged at the bottom of the low-frequency reactor, a hydraulic uniform distribution pipe is arranged below the bottom hydraulic distributor, electromagnetic generating devices are arranged outside the reaction tank body of the high-frequency reactor and the low-frequency reactor, an S-pole magnetic field generating device is arranged at the left side of the outside of the high-frequency reactor, an N-pole magnetic field generating device is arranged at the right side of the outside of the high-frequency reactor, an N-pole magnetic field generating device is arranged at the left side of the outside of the low-frequency reactor, and an S-pole magnetic field generating device is arranged at the right side of the outside of the low-frequency reactor, a plurality of central electrode rods are vertically and perpendicularly arranged in the high-frequency reactor and the low-frequency reactor, the central electrode rods of the high-frequency reactor and the central electrode rods of the low-frequency reactor are vertically and staggered, a plurality of central electrodes are arranged at the inside of the central electrode rods, a plurality of pair electrodes in hexagonal shape are arranged at the outside of the central electrodes, electrode gaps are arranged between the central electrodes and the pair electrodes, the central electrodes are arranged in a staggered and equidistant manner through the pair electrodes in hexagonal shape, gaps between the central electrode rods at the inside of the high-frequency reactor and the low-frequency reactor are electromagnetic reaction cavities, the electromagnetic reaction cavities contain oil-containing sewage, and the oil-containing sewage enters the inside of the reaction tank body through a filter screen.

2. The process equipment for efficiently treating oily wastewater by electromagnetic composite field according to claim 1, characterized in that, The reaction tank body is in the shape of a vertically spherical end tank body, an exhaust valve group is arranged at the center of the top end of the reaction tank body, a blowdown valve group is arranged at the center of the bottom end of the reaction tank body, an oil layer is arranged at the upper end of the inside of the reaction tank body, a water layer is arranged below the oil layer, an oil discharge valve group is arranged at the outside of the oil layer and penetrates the oil layer in a transverse direction, a water discharge valve group is arranged at the outside of the upper part of the water layer and penetrates the water layer in a transverse direction, and a high-low frequency electromagnetic reaction assembly is arranged below the water layer.

3. The process equipment for efficiently treating oily wastewater by electromagnetic composite field according to claim 1, characterized in that, The electromagnetic generating devices are external suspension electromagnetic generating devices, the electromagnetic generating devices comprise N-pole magnetic field generating devices and S-pole magnetic field generating devices, the electromagnetic generating devices are arranged in an annular and external wrapping manner at the outside of the reaction tank body, the electromagnetic generating devices all face the inside of the reaction tank body, and external electromagnetic elimination partitions are arranged between adjacent ends of the electromagnetic generating devices.

4. The process equipment for efficiently treating oily wastewater by electromagnetic composite field according to claim 1, characterized in that, The central electrode comprises a conductive core, a conductive anticorrosion layer and an insulation layer, the conductive core is in the shape of a cylinder, the conductive anticorrosion layer is arranged in an annular and external wrapping manner at the outside of the conductive core, the conductive anticorrosion layer is in the shape of a cylinder, and the insulation layer is arranged in an external wrapping manner at the outside of the conductive anticorrosion layer.

5. The process equipment for efficiently treating oily wastewater by electromagnetic composite field according to claim 1, characterized in that, The center electrode rod is vertically arranged and supported by arranging the support, the support comprises a transverse beam frame and a longitudinal beam frame, a plurality of center electrode rods are arranged between the transverse beam frame and the longitudinal beam frame, the transverse beam frame is a rectangular frame type and symmetrically parallel to each other and arranged at four corners, the transverse beam frame comprises an electrode top cross frame and an electrode bottom cross frame, a plurality of longitudinal beam frames are arranged between the electrode top cross frame and the electrode bottom cross frame, the plurality of longitudinal beam frames are symmetrically and equidistantly arranged, longitudinal beam insertion holes are arranged on the surface of the longitudinal beam frame, the plurality of longitudinal beam insertion holes are symmetrically and equidistantly arranged on the surface of the longitudinal beam frame, and the center electrode rod is arranged on the inner side of the longitudinal beam insertion hole.

6. The process equipment for efficiently treating oily sewage by electromagnetic composite field according to claim 5, characterized in that, The longitudinal beam insertion hole is arranged between two adjacent longitudinal beam insertion holes, the included angle formed by the center of the longitudinal beam insertion hole and the centers of two adjacent longitudinal beam insertion holes on one side is b, the included angle formed by the center of the longitudinal beam insertion hole and the centers of two adjacent longitudinal beam insertion holes on the same horizontal line on the left and right sides is a, the angle range of a is 60-150°, and the angle range of b is 30-150°.

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