CN203820556U - Three-level step-downbuck V-shaped waterpower rotational flow floating device - Google Patents

Abstract

The utility model provides a three-stage step-down V-shaped hydrocyclone air flotation device, which is applied to the high-efficiency treatment of oily sewage and industrial waste water. The gas-liquid two-phase flow enters the three-stage cyclone tangentially to form a rotating motion, and the oil, gas and water are separated in the centrifugal force field, and the water is thrown into the water collection tube, and at the same time passes through the three-stage cyclone cone and the guide vane gradually and instantly. The pressure is reduced, and the dirty oil is attached to the micro-bubbles and brought into the oil collection pipe to realize efficient purification treatment of the production water; the treatment capacity can be adjusted by changing the axial distance of the cyclones at all levels, so that the device can be used in a wide range; cleaning during backwashing operations The liquid flushes the tank in all directions through the flushing pipe, which has the function of self-flushing of the parts; the liquid gas passes through the triple separation of the liquid collector, the rectifier and the screen filter to become clean gas, which has the function of gas self-cleaning; equipped with pressure safety valve, The liquid level transmitter and liquid level control valve make the device highly automated; the whole device has a compact structure and is easy to install, operate and maintain.

Description

Three-stage step-down V-shaped hydrocyclone air flotation device

technical field

The utility model relates to a hydrocyclone air flotation device for an efficient treatment system for oily sewage and industrial waste water, in particular to a high-efficiency oil removal and purification device for production water integrated with swirl and air flotation on an offshore platform.

Background technique

With the deepening of the development of onshore and offshore oil and gas fields, the water content of the oil produced in the oil field is also gradually increasing, especially when the oil and gas fields enter the high water cut period and the tertiary oil recovery period, the average water content in the produced oil reaches more than 90%. At the same time, the difficulty of treatment of oily sewage also increases accordingly.

At present, pressurized dissolved air flotation, induced air flotation and compact air flotation are widely used in oily sewage and industrial wastewater treatment systems. The multiphase dissolved air pump air flotation system completes the process of water pressurization, gas suction and dissolution shearing in a multiphase dissolved air pump. The configuration of the system is simple, and the operation and maintenance are easy, but its power consumption and the cost of the pump itself cannot be ignored , and the multiphase soluble air pump has a strong shear emulsification effect on raw water, which will cause a significant reduction in purification efficiency. Hydro-induced air flotation, that is, jet air flotation, this technology has low power consumption, and at the same time, there are no rotating parts in the jet or high-speed Venturi tube, and the shear force is small, which will not cause the adherends to break up. However, the micro The particle size of the bubbles is large, and its efficiency is greatly affected by the outlet aperture of the ejector or high-speed Venturi tube. The requirements for water quality and pressure entering the nozzle are relatively strict, and small fluctuations may have a greater impact on the purification efficiency. Compact air flotation is the integration of air flotation and cyclone separation technology to process oil well output on offshore platforms to save space and reduce load, such as CrudeSep of CETCO in the United States, compact air flotation CFU of Epcon in Norway, Germany Siemens' VorSep, etc., however, is still in its infancy in China.

To sum up, there are many problems in the field application of the existing pressurized dissolved air flotation and induced air flotation, and the latest compact air flotation research is only in its infancy. At the same time, using new technology, new materials and processing technology, a new type of hydrocyclone air flotation integrated device has been developed. The application effect shows that the purified oily sewage (production water) meets the first-level sea discharge standards of the "Limits of Pollutant Discharge Concentration in Offshore Oil Exploration and Development" promulgated by the State Oceanic Administration, and realizes the need for efficient treatment of oily sewage on offshore platforms.

Contents of the invention

In order to overcome the defects and deficiencies of the existing air flotation technology, and to improve the research status of domestic compact air flotation which is still in its infancy, the purpose of this utility model is to provide a three-stage air flotation system suitable for oily sewage and industrial wastewater treatment. Step-down V-shaped hydrocyclone air flotation device. The hydrocyclone air flotation device organically combines the two oil-water separation technologies of hydrocyclone and air flotation, and is based on the V-shaped special structure and three-stage depressurization treatment process. Wide range, self-flushing of parts and self-cleaning of gas, high degree of automation, easy installation, operation and maintenance, etc.

The technical scheme adopted by the utility model to solve its technical problems is to develop a three-stage step-down V-shaped hydrocyclone air flotation device, which is mainly composed of an air flotation tank, a three-stage cyclone, an oil collection pipe, a liquid collector, and a gas rectifier. , screen filter, liquid inlet pipe, oil outlet pipe, water outlet pipe, sewage pipe and other parts. The gas-liquid two-phase flows through the liquid inlet pipe and enters the three-stage cyclone tangentially to form a rotating motion. In the centrifugal force field, the dense water gradually rises and is thrown into the water collection tube, and oil droplets and fine air bubbles are gradually migrated to the oil collection pipe to form The oil core, and the micro-bubbles with lower density migrate and float faster, which increases the chance of contact between the two. Through continuous contact and adhesion, oil droplets and micro-bubble adherents are formed. At the same time, through the cyclone each The gradual depressurization of the first-stage cone surface and guide vane combined with the instantaneous depressurization between the three-stage swirlers will continuously release a large number of dense microbubbles in the gas-liquid two-phase flow. Fully mixed, so that the dirty oil containing oil droplets and suspended matter is attached to the micro-bubbles and brought into the oil collecting pipe, so as to achieve the ideal degreasing effect. The separated dirty oil is discharged through the oil outlet pipe, and the water is discharged through the water outlet pipe. Preliminary separation of the gas flow through the liquid collector and the baffle of the gas rectifier, the collision and coalescence of larger oil droplets on the surface of the corrugated plate structure of the gas rectifier, and the inertial collision of small-sized oil droplets in the wire mesh cake of the wire mesh liquid filter, the wire mesh Interception and Brownian motion trap and coalesce the triple separation into clean gas which is expelled through the exhaust pipe.

The air flotation tank is made of pressure vessel material Q345R, and the tank cavity is lined with stainless steel 316L or two-way stainless steel. The air flotation tank adopts the structure of a vertical container, which is divided into two parts: the head and the tank body. The upper part adopts a circular plate-shaped head, and 24 to 48 screw holes are evenly arranged on the edge of the head. The body flange is connected, and the seal between the head and the tank body is sealed by a nitrile rubber gasket. Bosses are designed at the junction of the head and the tank body, and a cylindrical hole is processed in the central part of the head. The diameter of the hole is equal to the outer diameter of the oil outlet pipe; four flushing pipes are evenly arranged around the head along the circumferential direction. It enters the air flotation tank at the same time through four flushing pipes to ensure all-round flushing of all parts in the tank; an exhaust pipe is arranged between the pressure safety valve joint and the oil outlet pipe, and the clean gas after triple separation is discharged from the exhaust pipe Outside the air flotation tank.

The upper part of the tank body of the air flotation tank adopts a cylindrical cylinder, the lower part adopts a conical cylinder with a taper of 50°, and the bottom adopts a saddle-shaped seal, and the upper surface of the saddle-shaped seal is tangent to the conical surface of the upper conical cylinder. , thus the entire air floatation tank presents a V-shaped bullet-like structure. The middle and lower part of the tank body and the three-stage cyclone form a double-tube-shaped water collecting cylinder, which is used to collect the purified water phase of the production water. At the bottom of the water collection tube, a small amount of microbubbles remaining in the water phase are further separated. The central part of the bottom of the saddle-shaped seal of the tank is welded with a cylindrical slag collection tube. The upper part of the inner ring surface of the slag collection tube adopts an inverted cone with a taper of 40° and the lower part adopts a cylindrical shape with the same inner diameter as the sewage pipe to ensure three-stage rotation. The solid particles such as oil sludge separated by the flow device smoothly fall into the slag collection tube and enter the sewage pipe; eight screw holes are evenly arranged around the lower end surface of the slag collection tube.

A pressure safety valve joint is arranged on the circumference of the head flushing pipe, and is connected with the pressure safety valve with a flange. When the pressure in the air flotation tank exceeds the limit and a dangerous working condition occurs, the pressure safety valve automatically releases the pressure through mechanical action ; There are two upper and lower liquid level transmitter joints on the tank wall at the upper end of the oil collection pipe and the upper part of the water outlet pipe. Level and minimum liquid level signals are converted into electrical signals to implement high and low liquid level alarms and high-high liquid level and low-low liquid level shutdown operations. The tank wall at the upper end of the oil collection pipe is designed with a liquid level control valve connector, which is arranged 180° symmetrically with the upper liquid level difference transmitter joint. The liquid level control valve installed on it automatically detects the liquid level of the oil collection pipe and controls the flow of the oil outlet pipe. Sewage oil volume.

The liquid inlet pipe is used as a channel for the gas-liquid two-phase flow to enter the first-stage cyclone, and is located at the bottom of the air flotation tank. The liquid inlet pipe is divided into two pipes arranged in opposite directions at 180° from left to right. The saddle-shaped seal that runs through the tank body and its outlet enters the cone swirl section of the first-stage swirler tangentially; the outlets of the liquid inlet pipe are uniformly arranged in sequence along the axial direction of the tank body, and each outlet is connected to the vane of the guide vane at the corresponding position. The surfaces are flush to ensure that the gas-liquid two-phase flow smoothly cuts into the guide vanes of the first-stage swirler and merges with the rotating flow on the guide vanes; The gas-liquid two-phase flow of the guide vane has the same flow velocity as the original swirling flow on the guide vane at the corresponding position, so as to achieve smooth confluence.

The oil outlet pipe is the passage for dirty oil to flow out of the air flotation tank. It runs through the central part of the wire mesh filter, gas rectifier and liquid collector from top to bottom, and is finally inserted into the oil collection pipe and arranged concentrically with the oil collection pipe. The lower port of the oil outlet pipe is located at The bottom of the oil collecting pipe, in order to discharge all the dirty oil collected in the oil collecting pipe in time; the upper part of the oil outlet pipe is fixed by insert welding and the head, the middle part is positioned by the support of the liquid collector, and the lower part is evenly arranged by four on the oil collecting pipe The welded ribs are positioned.

The outlet pipe is used as the passage for the water phase to flow out of the air flotation tank after the purified produced water, and is located above the liquid inlet pipe. The sewage discharge pipe is located at the lower part of the slag collection tube of the tank body, and its outlet is located below the liquid inlet pipe and arranged 180° opposite to the outlet pipe; due to the difference in density, the oil sludge carried by the gas-liquid two-phase flow is a relatively dense solid particle It will fall into the slag collector at the bottom of the tank and be discharged through the sewage pipe; the inlet of the sewage pipe is connected to the bottom of the slag collector through a flange and screws, and the slag collector and the flange of the sewage pipe are sealed by a nitrile rubber gasket. The connection between the oil outlet pipe and the head, as well as the liquid inlet pipe, water outlet pipe and exhaust pipe and the tank wall is realized by socket welding, and the liquid inlet pipe, oil outlet pipe, water outlet pipe and sewage pipe are all realized by elbows and double-piece flanges pipeline connection.

The three-stage cyclone includes the first-stage cyclone, the second-stage cyclone and the third-stage cyclone, all of which adopt an inverted conical cylinder with a thick top and a thin bottom, so that the entire three-stage cyclone presents a V shape , the surface of the three-stage cyclone is treated with nickel-phosphorus plating, and the distance between the cones of each level of cyclone along the axial direction is equal, that is, the height of each level of cyclone is the same, and the gas-liquid two-phase flow cuts into the conical cyclone Finally, the rotating flow is generated and the rotating motion is carried out, and the pressure is gradually reduced on the inner cone surface of the cyclone cone at each level; the junction of the cones of the cyclone at all levels adopts a circular arc transition to avoid eddy currents caused by changes in the taper of the section, and Ensure the formation of continuous and stable swirling flow on the conical surfaces of the cyclones at all levels; the taper of the cones of the cyclones at all levels increases in turn to realize the instantaneous pressure reduction of the gas-liquid two-phase flow between the cyclones at all levels. The taper of the secondary and tertiary hydrocyclone cones is designed to be 40°, 50° and 60° sequentially to achieve the best separation effect of the production water on the cone surfaces of the hydrocyclones at all levels. The upper part of the third-stage cyclone adopts a cylindrical cylinder, and the inner diameter of the cylinder is equal to the diameter of the large end of the cone of the third-stage cyclone, so as to rectify the fluid separated by the third-stage cyclone in time to ensure the smooth entry of dirty oil The oil collecting pipe and the water phase are thrown into the water collecting tube smoothly. The upper end of the upper cylinder of the third-stage cyclone is processed with four grooves evenly arranged along the circumferential direction, and strip-shaped reinforcements are welded in each groove to realize the fixing of the upper part of the third-stage cyclone.

The cone of the first-stage cyclone and the upper end of the slag collector are fixed by circumferential welding, and the diameter of the small end of the cone is equal to the diameter of the large end of the inner ring of the slag collector. Guide vanes are arranged on the inner cone surface of the cone of the first-stage and second-stage swirlers, and the tooth line of the guide vanes is a helix extending along the cone surface, and the height of the helix is equal to the height of the swirlers at each stage , the helix angles between the expansion line of the helix and the axis of the swirler are 20° and 25°, respectively. The end surface of the guide vane is rectangular on the normal surface perpendicular to the tooth line and its height gradually decreases along the tooth line. For this reason, the contact line of the rotating flow on the guide vane surface changes from long to short to ensure that the rotating flow is on the guide vane. Reduce blood pressure gradually. The end of the guide vane of the first-stage swirler is connected to the start of the guide vane of the second-stage swirler, and the legal surface of the junction coincides to ensure that a continuous swirling flow is formed on the guide vane; The continuous protrusions of the rectangular triangular tooth shape formed along the helix on the conical surface of the cyclone are blade teeth. The number of blade teeth of each stage of cyclone decreases sequentially while the distance between blade teeth increases sequentially. The first stage cyclone The number of teeth of the blades is 3-5, the number of teeth of the blades of the second-stage cyclone is 1-3, and the third-stage cyclone has no guide vanes, so as to ensure the existence of swirling flow on the guide vanes of the cyclones at all levels. Sufficient pressure difference and instant decompression of swirling flow between guide vanes.

The oil collecting pipe is used to collect the dirty oil after the production water is purified. The upper part adopts a cylindrical cylinder, and the lower part adopts a cone with a taper of 90° to connect with the upper cylinder. The position of the upper port of the oil collecting pipe is higher than that of the upper port of the third-stage cyclone, so as to avoid the water phase with relatively high density from entering the oil collecting pipe and affecting the treatment effect of oily sewage. The upper part of the oil collecting pipe is connected with the reinforcing piece of the three-stage cyclone through the reinforcing bolt.

The liquid collector is used to initially separate the gas-liquid two-phase in the liquid-laden gas flow and collect the oil droplets separated from the gas rectifier and the wire mesh filter. The taper of the conical surface where the liquid collector cone is located is designed to be 130° to ensure liquid The best separation effect of air flow on the lower cone surface. The diameter of the large end of the cone of the liquid collector is smaller than the diameter of the large end of the cone of the third-stage cyclone, and at the same time, the diameter of the small end of the cone is larger than the outer diameter of the oil outlet pipe and smaller than the inner diameter of the oil collection pipe, so as to ensure that the oil droplets with liquid gas flow The "funnel-shaped" upper conical surface gathers and flows smoothly into the oil collection pipe. The large end of the cone of the liquid collector is processed with four grooves evenly arranged along the circumferential direction, and a strip-shaped support is welded in each groove to realize the fixation between the liquid collector and the air flotation tank.

The gas rectifier is located above the liquid collector, and the liquid-carrying airflow constantly changes direction and speed in the gas rectifier, causing the mist oil droplets to collide and coalesce with the surface of the corrugated plate structure, thereby ensuring that the mist oil droplets are separated from the airflow. The gas rectifier adopts a corrugated plate structure, including baffle plate, diversion plate, ring clamp and corrugated plate assembly. The corrugated plate assembly is installed vertically in the ring clamp. The oil droplets separated by the gas rectifier are collected by the liquid collector and then enter the oil collection inside the tube. Both the baffle and the diversion plate are made of inverted tapered two-way stainless steel plate with the same taper as the liquid collector, located between the tank wall and the ring clamp, the gas rectifier is fixed by circumferential welding, the baffle cone and the diversion plate The diameter of the small end of the cone is equal to the diameter of the outer ring of the ring clamp and smaller than the diameter of the large end of the cone of the liquid collector, so as to ensure that the oil droplets separated by the wire mesh filter and the gas rectifier enter the liquid collector smoothly middle. The conical surface of the baffle is used to change the direction of the liquid-laden gas flow and lead it into the corrugated plate assembly, while the "funnel-shaped" conical surface of the diversion plate ensures that the oil droplets separated by the wire mesh filter flow smoothly into the liquid collector through the gas rectifier. The lower end of the outer ring surface of the ring clamp is processed with a full-ring groove with a rectangular cross-section, which is fixed with the baffle plate and the drainage plate by clearance fit; the upper part of the ring clamp is processed with round holes of the same diameter arranged at equal intervals along the radial direction, and each hole Built-in pins are used to connect corrugated plate assemblies.

The corrugated plates are vertically arranged at equal intervals along the radial direction of the annular clamp, and correspond to the pin shafts on them one by one, forming a group of corrugated plate components with small spacing and tortuous flow channels. When the viscosity is high, take a large value, and when the viscosity of the well fluid is low, take a small value. The pressure drop of the liquid-laden gas flow through the gas rectifier is 5-15kPa. Each corrugated plate is made of two-way stainless steel, and its upper part is designed with U-shaped claws, which cooperate with the pin shaft. The angle between adjacent folded plates on the corrugated plate is 120°, and an oil trap is designed at the intersection of adjacent folded plates. The notch faces downward, and the groove width is three times the width of the corrugated plate; the oil catch grooves on adjacent corrugated plates are arranged alternately at equal intervals, and the tops of adjacent oil catch grooves are vertically overlapped to improve the liquid catch efficiency of the corrugated plate assembly.

The wire mesh liquid filter is located above the gas rectifier and is a fine filter for the liquid-laden airflow. The liquid-laden airflow is captured on the wire mesh and coalesces to form larger oil droplets. After the oil droplets are collected, they are collected by the gas rectifier and the liquid collector before entering In the oil collection pipe. The wire mesh liquid filter includes a snap ring and a wire mesh cake, which are installed horizontally. The snap ring is made of a ring-shaped steel plate, which is placed in the tank and positioned through the diversion plate of the gas rectifier. The wire mesh cake is embedded in the snap ring. It is made of Monel alloy wire with a diameter of 0.30mm and folded. The thickness is 150mm and the porosity reaches 99%. The surface area of the alloy wire per unit volume is about 3.5m ² /m ³ The pressure drop of the liquid flow through the screen filter is about 2kPa. At the same time, the screen cake is encrypted with polyvinyl chloride plastic wire with a diameter of 0.10mm, and forms a double-thickness and thin wire screen cake with alloy wire to improve the efficiency of the screen filtrate and retain as small as possible oil droplets.

The technical effect achieved by the utility model is that the hydrocyclone air flotation device organically combines the two oil-water separation technologies of hydrocyclone and air flotation, has the characteristics of compact structure, and saves space for the layout of the entire production water treatment system; The two-phase flow through the liquid inlet pipe tangentially enters the three-stage cyclone to form a rotating motion, the water gradually rises and is thrown into the water collection tube, the oil and gas gradually migrate to the oil collection pipe, and the oil droplets and fine air bubbles contact and adhere continuously to form adhesion At the same time, the gas-liquid two-phase flow through the conical surfaces of the cyclones and the gradual pressure reduction of the guide vanes at all levels combined with the instantaneous pressure reduction between the three-stage cyclones, the dirty oil adheres to the released microbubbles And bring it into the oil collection pipe, so as to realize the efficient purification treatment of the produced water; by changing the axial spacing of the cyclones at all levels, the maximum oily sewage treatment capacity of the device can be adjusted, which makes the device suitable for a wide range; cleaning during backwashing The liquid passes through four flushing pipes to flush the parts in the tank in all directions, which has the function of self-flushing of the parts; the preliminary separation of the liquid flow through the liquid collector and the baffle of the gas rectifier, the collision and coalescence of the gas rectifier, and the wire mesh filter The captured and coalesced triple separation becomes clean gas, which has the function of gas self-cleaning and reduces the loss of oil; it is equipped with a pressure safety valve to automatically release the excessive pressure in the tank, and the liquid level transmitter automatically detects the water in the water collection tank The liquid level control valve automatically detects the liquid level of the oil collection pipe and controls the amount of sewage oil, which makes the whole set of equipment highly automated; Collect and separate the water phase containing residual microbubbles; each interface of the whole set of equipment is connected by flanges, each part adopts a split structure, and is equipped with an automatic control system, making it easy to install, operate and maintain.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Figure 1 is a schematic diagram of a typical structure of a three-stage step-down V-shaped hydrocyclone air flotation device proposed according to the utility model.

Fig. 2 is a schematic diagram of the structure of the air flotation tank in the three-stage step-down V-shaped hydrocyclone air flotation device.

Fig. 3 is a schematic structural diagram of the first-stage cyclone in the three-stage pressure-reducing V-shaped hydrocyclone air flotation device.

Fig. 4 is a top view of the first-stage cyclone in the three-stage step-down V-shaped hydrocyclone air flotation device.

Fig. 5 is a schematic diagram of the structure of the second-stage and third-stage cyclones in the three-stage pressure-reducing V-shaped hydrocyclone air flotation device.

Fig. 6 is a top view of the second-stage and third-stage cyclones in the three-stage pressure-reducing V-shaped hydrocyclone air flotation device.

Fig. 7 is a schematic structural diagram of a gas self-cleaning device in a three-stage pressure-reducing V-shaped hydrocyclone air flotation device.

Fig. 8 is a schematic flow chart of a three-stage step-down V-shaped hydrocyclone air flotation device for purifying and treating produced water.

Fig. 9 is a schematic diagram of the backwashing operation flow of the three-stage step-down V-shaped hydrocyclone air flotation device.

In the figure, 1-air flotation tank, 2-wire mesh liquid filter, 3-gas rectifier, 4-liquid collector, 5-oil collecting pipe, 6-third-stage cyclone, 7-oil outlet pipe, 8-second stage Cyclone, 9-first-stage cyclone, 10-outlet pipe, 11-inlet pipe, 12-drainage pipe, 13-flushing pipe, 14-exhaust pipe, 15-pressure safety valve joint, 16-sealing Head, 17-double-headed stud, 18-tank body, 19-liquid level control valve connector, 20-water collecting tank, 21-slag collecting tank, 22-liquid level difference transmitter connector, 23-first-stage swirl flow Cone, 24-first-stage cyclone guide blade, 25-reinforcement, 26-cyclone cylinder, 27-third-stage cyclone cone, 28-second-stage cyclone cone , 29-second-stage swirler guide vane, 30-clip ring, 31-wire mesh cake, 32-drainage plate, 33-ring clamp, 34-corrugated plate assembly, 35-baffle plate, 36-support , 37-liquid collector cone.

Detailed ways

In Figure 1, the three-stage step-down V-shaped hydrocyclone air flotation device consists of an air flotation tank 1, a wire mesh filter 2, a gas rectifier 3, a liquid collector 4, a first-stage cyclone 9, and a second-stage cyclone. Flow device 8, third-stage cyclone 6, oil collecting pipe 5, oil outlet pipe 7, water outlet pipe 10, liquid inlet pipe 11 and sewage discharge pipe 12. When assembling, first connect the first-stage cyclone 9, the second-stage cyclone 8 and the third-stage cyclone 6 to the tank body of the air flotation tank 1 in order to ensure that the outlet of the liquid inlet pipe 11 enters the first stage tangentially. The cone swirl section of the first-stage cyclone 9, and then the oil collecting pipe 5 is connected to the reinforcement of the third-stage cyclone, and then the liquid collector 4, the gas rectifier 3 and the wire mesh liquid filter 2 are sequentially installed into the air flotation Inside the tank 1, ensure that the components are centered, and connect the head of the air flotation tank 1 with the tank body. The tension of each stud is the same, and finally install the oil outlet pipe 7, water outlet pipe 10 and Sewage pipe 12. When purging, close the valves on the oil outlet pipe 7, the water outlet pipe 10, the liquid inlet pipe 11 and the sewage pipe 12, and then inject nitrogen into the hydrocyclone air flotation device and its pipeline through the exhaust pipe on the head of the air flotation tank 1, And the oxygen content of the released nitrogen is monitored through the vent valve, and after the oxygen content reaches the limit value, the gas discharge port and the exhaust pipe valve are closed in sequence.

In Figure 1, when debugging the three-stage pressure-reducing V-shaped hydrocyclone air flotation device, first conduct a hydraulic test on the entire device, and the test pressure is 1.25 times the design pressure; then, check whether the external interface and the equipment interface are connected correctly. Whether the connection of each circuit is intact, whether the joint is loose, whether the grounding terminal is connected well; then, check whether the pipeline system joint in the device is leaking, whether it is unblocked, and whether the switch of each pipeline valve is correct; finally, connect the instrument air source and check the instrument Whether the inlet pressure of the table air source is between 500-800kPa, and whether the air source is clean and dry. During maintenance, each component should be overhauled once a year, and check whether there is foreign matter accumulation at the outlet of the liquid inlet pipe 11 in turn, whether the cones of the first-stage cyclone 9, the second-stage cyclone 8, and the third-stage cyclone 6 are Corrosion, whether there is corrosion on the surface of the guide vane on the three-stage cyclone, and when the wall thickness is close to 1mm, it needs to be replaced; check the three-stage cyclone, the oil collection pipe 5, the liquid collector 4, the gas rectifier 3 and the wire mesh When the dirt on the filter 2 is thicker than 3mm, backwashing operation is required. Dirts such as stubborn oil stains can be cleaned with alkali or oil detergent, while dirt such as scale and rust residue can be cleaned with hydrochloric acid and other cleaning fluids.

In FIG. 1 , the flow rate and flow rate of the produced water and its purified waste oil can be realized by adjusting the regulating valves on the inlet pipe 11 and the oil outlet pipe 7 respectively. The maximum treatment capacity of produced water can be realized by adjusting the axial spacing of the first-stage cyclone 9 , the second-stage cyclone 8 and the third-stage cyclone 6 . When the production water treatment capacity and inlet pressure are constant, the proper differential pressure ratio is controlled by adjusting the regulating valve on the oil outlet pipe 7 to ensure the oil removal rate of the production water.

In Fig. 2, the head 16 of the air flotation tank 1 is connected with the flange of the tank body 18 through the double-headed stud 17, and the cleaning liquid enters the air flotation tank 1 through the flushing pipe 13 to carry out the backwashing operation, and the slag collecting tank 21 It is used to collect solid particles such as oil sludge separated by the three-stage cyclone and send them into the sewage pipe 12. A pressure gauge is installed on the exhaust pipe 14 where the gas flows out of the air flotation tank 1 to monitor the gas outlet pressure in real time; a pressure safety valve is installed on the pressure safety valve joint 15 of the head 16 to ensure that the pressure is automatically released when the overpressure is dangerous. To protect the air flotation tank 1; the liquid level transmitter connector 22 of the tank body 18 is equipped with a liquid level transmitter, which automatically detects the liquid level difference of the water phase in the water collecting tube 20, and implements high liquid level and low liquid level Alarm and high-high liquid level and low-low liquid level shut-off operation; liquid level control valve is installed on the liquid level control valve joint 19 of the tank body 18, which can automatically detect the liquid level of the oil collection pipe 5 and control the amount of sewage oil discharged from the oil outlet pipe 7 After the production water is purified, the water phase flows out of the outlet pipe 10 of the air flotation tank 1 and a pressure gauge is installed to monitor the outlet pressure of the water phase in real time; on the oil outlet pipe 7 of the dirty oil flowing out of the air flotation tank 1, a pressure gauge is installed for real-time monitoring The outlet pressure of the dirty oil, and a differential pressure gauge is installed on the liquid inlet pipe 11 and the oil outlet pipe 7 to measure the pressure difference between the liquid inlet pipeline and the oil discharge pipeline in real time.

In Fig. 3 and Fig. 4, the guide vanes 24 of the first-stage cyclone are developed along the conical surface of the cone 23 of the first-stage cyclone, and the upper end of the first-stage cyclone cone 23 and the slag collector 21 pass through the circumference Fixed by welding. The outlet of the liquid inlet pipe 11 is flush with the vane surface of the guide vane 24 of the first-stage cyclone at the corresponding position, so as to ensure that the gas-liquid two-phase flow smoothly cuts into the guide vane and merges with the rotating flow on the guide vane. The liquid inlet pipe 11 where the gas-liquid two-phase flow enters the air flotation tank 1 is equipped with a thermometer and a pressure gauge to monitor the temperature and pressure of the gas-liquid two-phase flow in real time.

In Fig. 5 and Fig. 6, the second-stage swirler guide vane 29 is deployed along the conical surface of the second-stage swirler cone 28, and the first-stage swirler guide vane 24 end is connected with the second-stage swirl The initial end of the guide vane 29 of the device is connected. The taper of the third-stage cyclone cone 27 is the largest among the three-stage cyclones, and is designed to be 60°. The upper part of the cyclone cylinder 26 is used for rectification after the separation of the swirling flow. Through the cyclone cylinder 26 The reinforcement 25 welded in the groove at the upper end realizes the fixing of the upper part of the three-stage cyclone.

In Fig. 7, the gas self-cleaning device is composed of a liquid collector 4, a gas rectifier 3 and a wire mesh liquid filter 2, and the liquid collector 4 is used to initially separate the liquid-laden air flow and collect the gas rectifier 3 and the wire mesh liquid filter 2 to separate The oil droplets at the big end of the liquid collector cone 37 are welded with a support 36 to realize the fixation between the liquid collector 4 and the air flotation tank 1; the gas rectifier 3 separates the mist oil droplets from the air flow, and the ring clamp 33 and the baffle 35 and the diversion plate 32 are fixed by clearance fit, the corrugated plate assembly 34 is vertically arranged in the ring clamp 33 through the pin shaft, and each corrugated plate of the corrugated plate assembly 34 has an oil catch groove to enhance the collection of the gas rectifier 3 and coalescing ability; the screen filter 2 finely filters the liquid-laden airflow, the screen cake 31 is installed horizontally, and the snap ring 30 realizes the positioning between the screen filter 2 and the air flotation tank 1 through the drainage plate 32 .

In Fig. 8, when the production water is purified and treated, the gas-liquid two-phase flow containing fine air bubbles and production water flows through each outlet of the liquid inlet pipe 11 and sprays tangentially into the cone swirling section of the first-stage cyclone 9, and then Rotating motion is formed on the cone and guide vanes of the three-stage hydrocyclone and a rotating flow is generated. In the centrifugal force field, the water with high density gradually goes upwards and is thrown into the water collecting tube 20 of the air floatation tank 1, while the water with low density Oil droplets and micro-bubbles gradually migrate to the oil collecting pipe 5 to form an oil core. Due to the difference in density between oil droplets and micro-bubbles, the micro-bubbles migrate and float faster, which increases the chance of contact between the two, and through continuous contact and At the same time, the gas-liquid two-phase flow through the conical surfaces of the cyclones and the gradual pressure reduction of the guide vanes at all levels combined with the instantaneous pressure reduction between the three-stage cyclones, A large number of dense micro-bubbles will be continuously released, and the oil droplets and micro-bubbles will be fully mixed during the rising process of the oil droplets and micro-bubble adherents, so that the dirty oil containing oil droplets and suspended matter will adhere to the micro-bubbles and be brought into the oil collection pipe 5 , so as to achieve an ideal degreasing effect, the separated dirty oil is discharged through the oil outlet pipe 7, and the water is discharged through the water outlet pipe 10, while the solid particles with higher density such as sludge will fall into the slag collecting cylinder 21 at the bottom of the tank body 18 and be removed. It is discharged through the sewage pipe 12. After the separated liquid-laden gas flow passes through the liquid collector 4 and the baffle plate 35 of the gas rectifier 3, the flow direction and flow speed of the gas and liquid suddenly change, so that the gas and liquid are initially separated, and the separated oil falls into the liquid collector 4 , and the liquid-laden gas flow after preliminary separation enters a group of gas rectifiers 3 corrugated plate assemblies 34 with small spacing and tortuous flow channels. Obtain the energy that produces inertial force, the change of airflow direction and the inertia of oil droplets make the oil droplets collide with the surface of the corrugated plate and coalesce to form larger oil droplets, which settle into the liquid collector 4 by gravity; come out from the gas rectifier 3 The liquid-laden airflow continues to flow upwards and enters the wire mesh filter 2. In the double-thickness wire mesh cake 31, the oil droplets inertial collision, wire mesh interception and Brownian motion of small-sized oil droplets, the liquid-laden airflow is captured on the wire mesh. Collect and coalesce to form larger oil droplets. After the oil droplets are collected, they enter the liquid collector 4 through the gas rectifier 3 by gravity, and the oil separated by the gas self-cleaner is collected by the liquid collector 4 and then enters the oil collection pipe. 5, the clean gas is discharged from the air flotation tank 1 through the exhaust pipe 14 and recycled for reuse.

In Fig. 9, during the backwash operation, the cleaning liquid is sprayed into the air flotation tank 1 through the four flushing pipes 13 on the head 16 at the same time, and the snap ring 30 and the wire mesh cake of the wire mesh filter 2 in the tank body 18 are successively sprayed. 31, the diversion plate 32 of the gas rectifier 3, the ring clamp 33 and the corrugated plate assembly 34, the support 36 of the liquid collector 4, the cone 37 of the liquid collector and the oil collecting pipe 5 are cleaned in all directions; at the same time, the cleaning liquid passes through the oil collecting pipe 5 successively enter the third-stage cyclone and the water collecting cylinder 20, and the cones and guide vanes of the third-stage cyclone 6, the second-stage cyclone 8 and the first-stage cyclone 9 and the water-collecting cylinder 20 The double cylinder wall and liquid inlet pipe 11 tank walls are cleaned in all directions; after cleaning, the cleaning liquid containing dirt is discharged to the outside of the air flotation tank 1 through the oil outlet pipe 7, the water outlet pipe 10 and the sewage pipe 12 respectively.

Claims (10)

1. one kind three grades buck V-arrangement hydrocyclone air-floating apparatus, biphase gas and liquid flow tangentially enters the formation of three swirler device and rotatablely moves, water gradually upwards and get rid of into Water collecting tube, oil gas is progressively migrated to oil header formation wick, and by constantly contact and adhesion form oil droplet and micro bubble adherend, simultaneously through the progressively step-down of the swirler conical surfaces at different levels and guide vane and in conjunction with the moment step-down between three swirler device, in biphase gas and liquid flow, constantly discharge a large amount of intensive microbubbles, sump oil is attached on microbubble and brings in oil header, reach desirable deoiling effect, band liquid air-flow after separation is through liquid trap, the triple separation of gasotron and silk screen fluid strainer becomes clean air, it is characterized in that:

One air flotation tank; Described air flotation tank top adopts circular plate type end socket, and end socket surrounding is along the circumferential direction evenly arranged four washpipes; It is the divergent-cone wall of 50 ° that tank body lower part adopts tapering, and bottom it, adopts saddle type envelope body, and whole air flotation tank presents the structure of V-arrangement class sub warhead; Between tank body middle and lower part and three swirler device, form the Water collecting tube of Dual-barrel-shaped, be used for collecting the water of producing after water purifies; The central part of envelope body bottom is welded with cylindricality and receives slag cylinder, and employing tapering in receipts slag cylinder inner ring surface top is the back taper of 40 °;

One liquid-inlet pipe; Described liquid-inlet pipe is positioned at the tank base of air flotation tank, be divided into two pipelines of the 180 ° of reversed arrangement in left and right, each liquid-inlet pipe runs through respectively the saddle type envelope body of tank body and the cone eddy flow section that its outlet tangentially enters first step swirler, and liquid-inlet pipe outlet is axially evenly distributed and each outlet is concordant with the blade face of correspondence position guide vane successively along tank body;

One oil outlet pipe, rising pipe and blow-off pipe; Described oil outlet pipe is the passage of sump oil effluent gases buoyant tank, insert in oil header and with oil header arranged concentric; Described rising pipe is the passage that aqueous phase stream goes out air flotation tank, is positioned at the top of liquid-inlet pipe; The bottom that described blow-off pipe is positioned at tank body receives slag cylinder, its outlet be positioned at the below of liquid-inlet pipe and with 180 ° of reversed arrangement of rising pipe;

One three swirler device; Described three swirler device all adopts upper coarse and lower fine back taper cylindrical shell, and whole three swirler device presents V-arrangement, and swirlers at different levels have identical height, and the tapering of swirler cones at different levels increases successively; On the inner conical surface of the first step and second stage swirler cone, be all furnished with guide vane, guide vane tooth trace is the spiral-line launching along the conical surface, and the helix angle between the evolute of spiral-line and swirler axis is respectively 20 ° and 25 °; The continuous projection of the rectangle triangle tooth form forming along spiral-line on the swirler conical surfaces at different levels is blade tooth, and the blade tooth number of swirlers at different levels reduces successively and blade tooth spacing increases successively;

One oil header; Described oil header is used for collecting the sump oil of producing after water purifies, and its top adopts cylindrical tube, and bottom employing tapering is the cone of 90 °, and the position of oil header upper port will be higher than the upper port of three swirler device;

One liquid trap; The taper design of described liquid trap cone place cone surface is 130 °, and the large end disc diameter of liquid trap cone is less than the diameter of the large end of the third stage swirler conical surface, and small end disc diameter is greater than oil outlet pipe external diameter and is less than oil header internal diameter simultaneously;

One gasotron; Described gasotron adopts corrugated plate dst structure, and waved plate assembly at right angle setting is in ring-shaped clip, and baffle plate and drainage plate all adopt the two-way stainless-steel sheet of back taper with the identical tapering of liquid trap; Each waved plate is radially equidistantly arranged vertically along ring-shaped clip, and corresponding one by one with the bearing pin on it, forms one group of waved plate assembly that spacing is very little and flow passage is tortuous; On waved plate, adjacent flap intersection is designed with and catches oil groove, and down, groove width is that three times of waved plates are wide to notch;

One silk screen fluid strainer; Described silk screen fluid strainer is positioned at gasotron top, employing level is installed, silk screen cake embeds in snap ring, the monel wire that is 0.30mm by diameter is worked out and is folded and forms, adopt diameter is that the igelite silk of 0.10mm is encrypted simultaneously, forms the silk screen cake of dual thickness silk with B alloy wire.

2. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, it is characterized in that: on the end socket washpipe place circumference of described air flotation tank, be furnished with pressure security valve union, and connect with pressure safety valve with ring flange, when air flotation tank internal pressure exceedes limit value and while there is dangerous working condition, pressure safety valve is by the automatic relief pressure of mechanical effect;

On the tank wall on described oil header upper end and rising pipe top, be provided with upper and lower two liquid level difference transmitter joints, liquid level difference transmitter detects the liquid level difference of water in tank body Water collecting tube automatically, and change the highest liquid level and minimum liquid level signal into electric signal, implement high liquid level and low liquid level warning and high liquid level and low liquid level and turn-off operation;

On the tank wall of described oil header upper end, be designed with level control valve joint, be arranged symmetrically with 180 ° of upper liquid level difference transmitter joints, the liquid level of the level control valve automatic detection oil pipe of installing on it is also controlled the blowdown oil mass of oil outlet pipe.

3. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, it is characterized in that: described liquid-inlet pipe outlet caliber from bottom to top reduces in turn, ensures that the biphase gas and liquid flow of incision guide vane possesses identical flow velocity with original rotating fluid on correspondence position guide vane.

4. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, is characterized in that: the tapering of the first step, the second stage and the third stage swirler cone of described three swirler device is designed to 40 °, 50 ° and 60 ° successively;

Described first step swirler cone is realized and being fixed by circumferential weld with receiving slag cylinder upper end, and the diameter of cone small end equals to receive the diameter of the large end of ring cone surface in slag cylinder simultaneously;

Described third stage swirler top adopts cylindrical tube, and the upper end of cylindrical shell is processed with four grooves that are along the circumferential direction evenly arranged, and welds respectively the tabular reinforcing member of bar shaped in each groove, realizes the fixing of three swirler device top.

5. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, is characterized in that: the height of the guide vane spiral-line of described three swirler device equals the height of swirlers at different levels;

Described guide vane is that rectangle and its height reduce gradually along tooth trace at the normal plane end face perpendicular to tooth trace, and the osculatory of rotating fluid on water conservancy diversion blade face shortened by long for this reason.

6. according to three grades of buck V-arrangement hydrocyclone air-floating apparatus described in claim 4 or 5, it is characterized in that: described first step swirler guide vane end connects with second stage swirler guide vane initiating terminal, and the normal plane end face of junction matches;

The blade tooth number of described first step swirler is 3～5, and the blade tooth number of second stage swirler is 1～3, and third stage swirler is without guide vane.

7. according to three grades of buck V-arrangement hydrocyclone air-floating apparatus described in any one in claim 1-6, it is characterized in that: described oil outlet pipe top is fixed with end socket by inserting weldering, location is realized by the strut member of liquid trap in middle part, and bottom positions by the welding gusset that on oil header, four are evenly arranged;

Described oil header top is realized and being connected with the reinforcing member of three swirler device by adding fixing bolt;

The large end of described liquid trap cone is processed with four grooves that are along the circumferential direction evenly arranged, and welds respectively the tabular strut member of bar shaped in each groove, realizes fixing between liquid trap and air flotation tank.

8. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, it is characterized in that: the baffle plate of described gasotron and drainage plate are between tank wall and ring-shaped clip, and the small end disc diameter of baffle plate cone and drainage plate cone equals the outer ring surface diameter of ring-shaped clip and is less than the large end disc diameter of liquid trap cone;

The lower end of the ring-shaped clip outer ring surface of described gasotron is processed with the loopful groove of a square-section, adopts running fit to realize fix with baffle plate and drainage plate; Ring-shaped clip top is radially processed with the same diameter circular hole of equidistant layout, and each eyelet is embedded in bearing pin and is used for connecting waved plate assembly.

9. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, is characterized in that: the waved plate spacing of described gasotron is 15～35mm, are 5～15kPa with liquid air-flow by the pressure drop of gasotron;

Described waved plate is made up of two-way stainless steel, and its upper design has U-shaped claw, coordinates with bearing pin, and the angle on waved plate between adjacent flap is 120 °; The oil groove of catching in adjacent corrugated plate is equidistantly staggered, simultaneously adjacent vertically arranged superposed of top of catching oil groove.

10. three grades of buck V-arrangement hydrocyclone air-floating apparatus according to claim 1, is characterized in that: the snap ring of described silk screen fluid strainer adopts doughnut-shaped steel plate, insert tank body and realize location by the drainage plate of gasotron;

The silk screen cake thickness of described silk screen fluid strainer is 150mm, and porosity reaches 99%, and the B alloy wire surface-area of unit volume is about 3.5m ²/ m ³, be about 2kPa with liquid air-flow by the pressure drop of silk screen fluid strainer.