AEPCFU automatic cyclone and air flotation integrated module and working method

Abstract

The present application relates to a kind of AEPCFU automatic cyclone gas float integrated module, comprising: outer cylinder, inner cylinder, flocculation reaction zone, cyclone water distribution area, solid-liquid floatation separation zone, micro-positive pressure gas-liquid separation zone, inclined plate sedimentation separation zone and pollution area;Vertical inside outer cylinder is equipped with inner cylinder, inner cylinder is coaxial with outer cylinder, the height of inner cylinder is lower than outer cylinder, the sidewall of inner cylinder is cylindrical cylindrical surface-like support structure;Inner cylinder is hollow device.The beneficial effects of the present application are: small equipment area, low investment and operating cost;Low power consumption;Adopt water-gas positive pressure mixing mode, large amount of dissolved gas;Oil-water separation efficiency is more than 95%, and oil-water separation efficiency is higher.The present application is also provided with automatic sludge discharge and cleaning device, can carry out automatic sludge discharge and sludge pool cleaning;It is suitable for urban and rural industrial water supply and drainage treatment, oil exploitation refining and new energy high-concentration organic wastewater treatment, circulating water treatment, oxygen-rich biochemical, sludge concentration, material separation and other fields.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of sewage treatment, and particularly relates to an AEPCFU automatic cyclonic air flotation integrated module and a working method. BACKGROUND

[0002] The air flotation system water treatment technology is a technology widely applied in water treatment engineering projects in the world at present. The conventional primary and secondary air flotation processes in China are mainly traditional horizontal flow dissolved air flotation processes, and the rest are overhead type circular shallow air flotation processes, vertical jet air flotation processes and the like. The overhead type circular shallow air flotation processes and the vertical jet air flotation processes are composed of a reaction tank main body, a dissolved air tank, a slag scraper, an air compressor and an instrument pump valve in series, and the treatment residence time is mostly above 30 min to about 1 hour. The water treatment capacity of a single unit is about 100 m 3 / h. In actual application, several units need to be combined, the land occupation is large, the investment and operation cost are high, and the jet air flotation process also has the problem of high power consumption. SUMMARY

[0003] The application aims at overcoming the deficiencies of the existing air flotation technologies at home and abroad, and provides an AEPCFU automatic cyclonic air flotation integrated module and a working method.

[0004] The AEPCFU automatic cyclonic air flotation integrated module is characterized by comprising an outer cylinder, an inner cylinder, a flocculation reaction zone, a cyclonic water distribution zone, a solid-liquid floatation separation zone, a micro-positive pressure gas-liquid separation zone, an inclined plate sedimentation separation zone and a blowdown zone. The inner cylinder is vertically arranged in the outer cylinder, the inner cylinder is coaxial with the outer cylinder, the height of the inner cylinder is lower than that of the outer cylinder, and the side wall of the inner cylinder is a cylindrical cylindrical surface support structure. The inner cylinder is a hollow device.

[0005] The annular cylinder between the outer cylinder and the inner cylinder is formed from top to bottom into the micro-positive pressure gas-liquid separation zone, the cyclonic water distribution zone, the solid-liquid floatation separation zone, the inclined plate sedimentation separation zone and the blowdown zone.

[0006] The flocculation reaction zone is located at the water inlet end of the outer cylinder, and the flocculation reaction zone is provided with a water inlet pipe and a pipeline mixer; the water inlet pipe is connected to the water inlet end of the pipeline mixer, the water outlet end of the pipeline mixer is communicated with the water pipe, the water inlet pipe penetrates through the outer cylinder into the cyclone water distribution zone, and the pipeline mixer is used for selectively adding flocculants; the water outlet direction of the water pipe extending into the cyclone water distribution zone is the tangent direction of the outer cylinder, so that the water inlet can form a cyclone in the cylinder, and the water is distributed in the form of cyclone; since the inner wall of the inner cylinder contacted by the water inlet in the cyclone water distribution zone is a cylindrical surface, when the water inlet generates a cyclone, the cyclone can flow along the outer wall of the inner cylinder without resistance, if the outer wall of the inner cylinder is not cylindrical, but there is an angle on the side wall, the water inlet will collide on the outer wall to produce a deflection, and a streamline water flow cannot be generated; the purpose of the cyclone is to uniformly distribute the water pressure, promote flocculation, balance the water pressure, and save the stirring time;

[0007] A gas supply device and a water supply pipe are arranged below the flocculation reaction zone outside the outer cylinder, and the water supply pipe is connected to the gas supply device through the opening on the upper side; a gas-liquid mixer is arranged in the inner cylinder, and the water supply pipe extends into the outer cylinder to connect the liquid inlet of the gas-liquid mixer; the gas must be dissolved in water, so that the gas bubbles can generate acceleration when the pressure is reduced, so that the flocculation body is instantly adsorbed on the micro-bubbles to float up, therefore, the gas stirring is first carried out in the pipeline (in the case that the flow rate in the pipeline is large, the pressure of the water is small, and the gas discharged from the gas supply device can enter the gas-liquid mixer only by a low gas pressure), and then the gas-liquid mixture is distributed to the solid-liquid floating separation zone; the side wall of the gas-liquid mixer is uniformly provided with an exhaust release device for further mixing the gas-liquid mixture and generating micro-bubbles, so that the micro-bubbles are instantly adsorbed on the flocculation body (SS) to float up from bottom to top;

[0008] In the solid-liquid floating separation zone, a communicating vessel for discharging the reaction gas-liquid is arranged on the plane of the top of the inner cylinder which is flush with the outer cylinder, the gas-liquid mixer generates micro-bubbles dissolved in water, the micro-bubbles adsorb small-particle floating sludge and instantly accelerate the floating, and enter the solid-liquid floating separation zone; a sludge collecting disc is arranged at the top of the inner cylinder, the height of the top of the sludge collecting disc (the height is different according to the type of the treated liquid) is lower than the height of the communicating vessel, and the height difference between the two allows the micro-bubbles with small-particle floating sludge to easily overflow along the side wall of the sludge collecting disc into the bottom of the sludge collecting disc for collection; a sludge discharge port is arranged at the center of the sludge collecting disc, and the sludge discharge port is connected to a sludge discharge pipe; the outlet end of the sludge discharge pipe extends to the outside of the outer cylinder for sludge discharge; a gas-liquid discharge pipeline is arranged at the top of the gas-liquid mixer, and a liquid level control valve is arranged on the gas-liquid discharge pipeline for controlling the working liquid level of the gas-liquid mixer; an eight-shaped slope solid body is fixedly arranged around the lower part of the communicating vessel, so that the micro-bubbles with small-particle floating sludge can more quickly float up to the top of the sludge collecting disc; the sludge collecting disc is equivalent to a sunken circular groove; when the micro-bubbles gradually float up, the floating sludge flows from the top of the sludge collecting disc into the sludge collecting disc, defoaming, and then flows into the inlet of the sludge collecting pipe;

[0009] An exhaust hole is arranged at the top of the outer cylinder for discharging the gas generated during the chemical flocculation reaction and floating separation in the floating separation zone;

[0010] The inner cylinder side of the lower part of the gas-liquid mixer is provided with an inclined plate settling separation zone, one or two inclined plates are arranged in the inclined plate settling separation zone along the vertical direction, so as to facilitate the downward settlement of large-particle pollutants along the slope; the inner part of the inner cylinder in the inclined plate settling separation zone is an intermediate pool, a plurality of water outlets are uniformly arranged from the top of the side wall of the intermediate pool to the top of the inclined plate, and the water flow flows into the water outlets along the bottom surface of the inclined plate; the water flow enters the intermediate pool from the water outlets; the bottom of the intermediate pool is provided with a drain pipe;

[0011] The lower part of the inclined plate settling separation zone is a pollution discharge zone, the top of the pollution discharge zone is provided with an interceptor, and the bottom of the interceptor is provided with a sludge pool; the large-particle pollutants that settle on the top of the interceptor through the inclined plate are further dewatered, and the sludge settles to the bottom; after the static settlement of the sludge and water, the water is in the upper layer and the sludge is in the lower layer; the interceptor applies the principle of microgravity to separate the sludge and water, separate the solid and liquid, and concentrate the sludge; the water inlet branch pipe and the pollution discharge pipe corresponding to the sludge pool are provided, the pollution discharge valve is arranged on the water inlet branch pipe and the pollution discharge pipe, the water inlet branch pipe is used for periodically flushing the sludge in the sludge pool, and the sludge is immediately flushed away when the sludge accumulation does not exceed the set amount, and the pollution discharge valve is used for controlling the drain pipe to discharge the sludge and water mixture after flushing; the flushing water is a branch of the water inlet, and the flushing cycle is generally 6 hours once, and each time is about 3 minutes, which is online flushing, and the air flotation integrated module does not stop operating.

[0012] As a preferred, the water pipe extending into the cyclone water distribution zone is provided with an elbow, and the flushing end of the water inlet branch pipe is also provided with an elbow; the elbow utilizes the power of the water inlet, and does not need to be additionally designed to increase the flushing water.

[0013] As a preferred, the residue discharge pipe is arranged in the space at the bottom of the gas-liquid mixer in the inner cylinder.

[0014] As a preferred, the residue discharge hole is connected with the water supply pipe connected with the pipeline mixer by a gas conveying pipeline, and the connection is located behind the pipeline mixer; the gas discharged from the top of the whole device has a certain micro-positive pressure, which can be used for the pipeline mixer; the pressure in the pipeline behind the pipeline mixer is lower than the pressure of the discharged gas, so that the discharged gas is sucked into the pipeline; on the one hand, the gas can stir the liquid in the pipeline, and on the other hand, the exhaust gas can be prevented from being discharged into the air.

[0015] As a preferred, the front end of the water supply pipe connected with the gas supply device is also connected with a water supply device, which is used to provide the liquid required for generating the gas-liquid mixture for the gas supply device; the water supply device is connected with the water inlet branch pipe equipped with an automatic flushing valve.

[0016] As a preferred, an eight-shaped slope entity is fixedly arranged at the lower part of the communicating vessel, so that the micro-bubbles with small-particle floating sludge can float up to the top of the residue collection disc more quickly; the residue collection disc is equivalent to a sunken circular groove; when the micro-bubbles float up, the floating sludge flows into the residue collection disc from the top of the residue collection disc, defoams and flows into the center residue collection pipe inlet.

[0017] As preferred, the inclined plate is downwardly inclined at an angle of 45° to 60° with the inner cylinder.

[0018] The working method of the AEPCFU automatic cyclone-flotation integrated module comprises the following steps:

[0019] The water inlet pipe is connected to the water inlet, and a flocculating agent is selectively added to the pipe mixer according to the water quality of the water inlet. The water outlet of the water inlet pipe is discharged from the elbow, and a cyclone is formed in the annular column between the inner cylinder and the outer cylinder. The elbow utilizes the power of the water inlet, and does not need to additionally design flushing water. The cyclone can rotate along the outer wall of the inner cylinder without resistance; the purpose of the cyclone is to make the water pressure distribution uniform, promote flocculation, balance the water pressure, and save stirring time;

[0020] The gas supply device supplies gas to the water supply pipe from the side wall opening of the water supply pipe before the water supply enters the gas-liquid mixer, and the gas stirring promotes gas-liquid mixing in the water supply pipe, generating gas-liquid mixture. After the gas-liquid mixture enters the solid-liquid flotation separation zone, part of the dregs can immediately float up; the gas-liquid mixture is discharged in the form of micro-bubbles from the gas release device on the side wall of the gas-liquid mixer, and the average particle size of the micro-bubbles is 10 μm; the micro-bubbles adsorb small particle dregs and accelerate the floating and rising of the small particle dregs, enter the solid-liquid flotation separation zone, and overflow along the side wall of the dreg collecting disc into the bottom of the dreg collecting disc and gradually defoam, and the dregs are concentratedly discharged from the dreg discharge port; the gas generated by the defoaming of the micro-bubbles is discharged from the gas discharge hole at the top of the outer cylinder;

[0021] At the same time that the micro-bubbles adsorb small particle dregs and accelerate the floating and rising of the small particle dregs, large particle pollutants in the water inlet sink downward to the inclined plate, and the water flow enters the middle pool from the water outlet hole along the bottom surface of the inclined plate, and is discharged from the water discharge pipe on the side of the middle pool;

[0022] The large particle pollutants sink downward along the slope of the inclined plate to the top of the interceptor, the interceptor further dehydrates the large particle pollutants, and then the sludge is settled into the sludge pool below the interceptor; after the static settlement of the sludge and water, the water is in the upper layer and the sludge is in the lower layer. The interceptor applies the principle of micro-gravity to achieve the purposes of sludge and water diversion, solid-liquid separation, and sludge concentration. The flushing water enters the sludge pool from the tee pipe of the water inlet pipe at a fixed time, and the sludge in the sludge pool is periodically flushed away by the cyclone. The sludge is immediately flushed away when the sludge accumulation does not exceed the set amount, and the sludge and water mixture after flushing is discharged from the sludge discharge pipe under the control of the sludge discharge valve.

[0023] As preferred:

[0024] The gas generated by micro-bubble defoaming is discharged from the exhaust hole on the top wall of the outer cylinder, and then is recycled to the water supply pipe connected with the pipeline mixer, the gas discharged from the top of the whole device has a certain micro-positive pressure, the micro-positive pressure gas discharged from the exhaust hole can be used to dissolve gas in the water supply pipe, gas agitation is carried out to promote gas-liquid mixing, and gas-liquid mixed liquid is generated, and more dregs can be quickly floated after the gas-liquid mixed liquid enters the buoyancy separation zone;

[0025] The part of the treated water generated by air floatation in the annular column between the outer cylinder and the inner cylinder is pumped into the water supply device and the gas supply device by the circulation pump, and the gas supply device supplies compressed gas and water solution with pressure to the gas-liquid mixer;

[0026] In the petroleum exploitation industry, the gas supplied by the gas supply device is nitrogen or natural gas; in most environmental water treatment project designs, the gas supplied by the gas supply device is compressed air, and the compressed air has a large oxygen supply amount and is the most important natural resource for biological water purification and environmental protection.

[0027] The beneficial effects of the present application are:

[0028] The AEPCFU automatic cyclone air floatation integrated module designed in the present application is suitable for urban and rural industrial water supply and drainage treatment, petroleum exploitation and refining, new energy high-concentration organic wastewater treatment, circulating water treatment, oxygen-rich biochemical treatment, sludge concentration, material separation and the like.

[0029] In the present application, the water is formed into a cyclone in the cylinder, the gas generated by micro-bubble defoaming is discharged from the exhaust hole on the top wall of the outer cylinder, and then is recycled to the water supply pipe connected with the pipeline mixer, the gas discharged from the top of the whole device has a certain micro-positive pressure, the micro-positive pressure gas discharged from the exhaust hole can be used to dissolve gas in the water supply pipe, gas agitation is carried out to promote gas-liquid mixing, and gas-liquid mixed liquid is generated, and more dregs can be quickly floated after the gas-liquid mixed liquid enters the solid-liquid buoyancy separation zone; the part of the treated water generated by air floatation is supplied to the gas-liquid mixer by the 0.5Mpa circulation pump through the gas supply device and the pipeline; the mixed liquid is recycled to the gas supply device, and then compressed gas and water solution with pressure are supplied to the gas-liquid mixer through the gas supply device and the pipeline.

[0030] The present application has the advantages of small equipment area, low investment and operation cost, low power consumption of the 0.3MPa or so pressure gas dissolving pump, large gas dissolving amount by using the water-gas positive pressure mixing mode, high solid-liquid separation and oil-water separation efficiency of more than 95%, and high three-phase oil-water separation efficiency of gas, liquid and solid. The present application is further provided with an automatic sludge discharge and cleaning device, and can automatically discharge sludge and clean the sludge pool. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the AEPCFU automatic cyclone air floatation integrated module;

[0032] Figure 2 Schematic diagram of generating cyclone for water inlet pipe with elbow;

[0033] Figure 3 Schematic diagram of solid-liquid floatation separation zone and micro-positive pressure gas-liquid separation zone part;

[0034] Figure 4 Schematic diagram of slag discharge port part;

[0035] Figure 5 Schematic diagram of AEPCFU automatic cyclone air flotation integrated module with air exhaust function;

[0036] Figure 6 Schematic diagram of AEPCFU automatic cyclone air flotation integrated module with flushing water function;

[0037] Figure 7 Schematic diagram of gas-liquid flow direction in AEPCFU automatic cyclone air flotation integrated module.

[0038] The figure mark explanation: water inlet pipe 1, pipe mixer 2, elbow 3, outer cylinder 4, support structure 5, air supply device 6, water supply device 7, gas-liquid mixer 8, slag collecting disc 9, communicating vessel 10, exhaust hole 11, liquid level control valve 12, inclined plate 13, slag discharge port 14, slag discharge pipe 15, interceptor 16, sludge tank 17, drain pipe 18, sewage valve 19, water inlet pipe branch 20, inner cylinder 21. DETAILED DESCRIPTION

[0039] The application will be further described below in conjunction with examples. The following examples are only used to help understand the application. It should be pointed out that for ordinary people in the technical field, several modifications can be made without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application. Example 1

[0040] As shown in Figure 1 and Figure 7 , an AEPCFU automatic cyclone air flotation integrated module includes: an outer cylinder 4, an inner cylinder 21, a flocculation reaction zone, a cyclone water distribution zone, a solid-liquid floatation separation zone, a micro-positive pressure gas-liquid separation zone, an inclined plate sedimentation separation zone, and a sewage discharge zone; the inner cylinder 21 is vertically arranged in the outer cylinder 4, the inner cylinder 21 is coaxial with the outer cylinder 4, the height of the inner cylinder 21 is lower than that of the outer cylinder 4, and the side wall of the inner cylinder 21 is a cylindrical cylindrical surface-shaped support structure 5; the inner cylinder 21 is a hollow device;

[0041] The annular cylinder between the outer cylinder 4 and the inner cylinder 21 forms, from top to bottom, a micro-positive pressure gas-liquid separation zone, a cyclone water distribution zone, a solid-liquid floatation separation zone, an inclined plate sedimentation separation zone, and a sewage discharge zone; as shown in Figure 2 , the water pipe extending into the cyclone water distribution zone has an elbow 3;

[0042] The flocculation reaction zone is located at the water inlet end of the outer cylinder 4, and the flocculation reaction zone is provided with a water inlet pipe 1 and a pipeline mixer 2. The water inlet pipe 1 is connected to the water inlet end of the pipeline mixer 2, and the water outlet end of the pipeline mixer 2 is communicated with the water pipe. The water inlet pipe penetrates through the outer cylinder 4 into the cyclone water distribution zone. The pipeline mixer is used for selectively adding flocculants. The water outlet direction of the water pipe extending into the cyclone water distribution zone is the tangent direction of the outer cylinder 4. Only in this way, the water inlet can form a cyclone in the cylinder, and the water is distributed in the form of cyclone. Since the inner wall of the inner cylinder contacted by the water inlet in the cyclone water distribution zone is a cylindrical surface, when the water inlet generates a cyclone, the cyclone can quickly concentrate and rotate along the outer wall of the inner cylinder without resistance. If the outer wall of the inner cylinder is not cylindrical, but there is an angle on the side wall, the water inlet will collide with the outer wall to produce a deflection, and a streamline water flow will not be generated. The purpose of the cyclone is to make the water pressure distribution uniform, promote flocculation, balance the water pressure, and save the stirring time.

[0043] A gas supply device 6 and a water supply pipe are arranged below the flocculation reaction zone outside the outer cylinder 4. A gas-liquid mixer 8 is arranged in the inner cylinder 21. The water supply pipe is connected to the gas supply device 6 through the opening on the upper side. The water supply pipe can pressurize and aerate part of the treated water generated by the air floatation, and then the water enters the gas-liquid mixer 8. The water supply pipe extends into the outer cylinder 4 and is connected to the liquid inlet of the gas-liquid mixer 8. The gas must be dissolved in water. When the pressure is reduced, the bubbles can generate acceleration, so that the flocculation body can instantly adsorb the micro-bubbles and float up. Therefore, the gas is first stirred in the pipeline (in the case of high flow rate in the pipeline, the pressure of the water is low, and the gas discharged by the gas supply device can enter the gas-liquid mixer only by low pressure), and then the gas-liquid mixture is distributed to the solid-liquid floatation separation zone. The side wall of the gas-liquid mixer 8 is uniformly provided with an exhaust release device for further mixing the gas-liquid mixture and generating micro-bubbles, so that the micro-bubbles can instantly adsorb the flocculation body (SS) and float up.

[0044] In the solid-liquid floatation separation zone, a communicating vessel 10 for discharging reaction gas-liquid is arranged on the plane of the top of the inner cylinder 21 which is flush with the outer cylinder 4. The gas-liquid mixer generates micro-bubbles dissolved in water. The micro-bubbles adsorb small particles of dregs and instantly accelerate the floatation. The inner cylinder 21 is provided with a dreg collecting disc 9 at the top. The height of the top of the dreg collecting disc 9 (the height will be different according to the type of the treated liquid) is lower than the height of the communicating vessel 10. The height difference between the two allows the micro-bubbles with small particles of dregs to easily overflow along the side wall of the dreg collecting disc and collect at the bottom of the dreg collecting disc. As shown in Figure 3 Figure 4 ​As shown, the center of the slag collecting disc 9 is provided with a slag discharge port 14, which is connected with a slag discharge pipe 15; the outlet end of the slag discharge pipe 15 extends to the outside of the outer cylinder 4 for slag discharge; the top of the gas-liquid mixer 8 extends to the solid-liquid floating separation zone and the micro-positive pressure gas-liquid separation zone through a gas-liquid discharge pipeline, and a liquid level control valve 12 is arranged on the gas-liquid discharge pipeline, which is used to control the working liquid level of the gas-liquid mixer; the slag discharge pipe 15 is arranged in the space at the bottom of the gas-liquid mixer 8 in the inner cylinder 21;

[0045] The top of the outer cylinder 4 is provided with a gas discharge hole 11, which is used to discharge the gas generated during the floating separation of the chemical flocculation reaction; as shown in the figure, Figure 5 As shown, the gas discharge hole 11 is connected with the water supply pipe of the pipeline mixer 2 through a gas conveying pipeline, and the connection is located behind the pipeline mixer 2. The gas discharged from the top of the whole device has a certain micro-positive pressure, which can be used for the micro-positive pressure of the gas discharged from the gas discharge hole 11. The pressure in the pipeline behind the pipeline mixer 2 is lower than the pressure of the discharged gas, so that the discharged gas is sucked into the pipeline. On the one hand, it can play a role in stirring the liquid in the pipeline with gas, and on the other hand, it can prevent the exhaust gas from being discharged into the air;

[0046] The inner cylinder 21 at the lower part of the gas-liquid mixer 8 is provided with an inclined plate settling separation zone on the side surface. One or two inclined plates 13 are arranged in the inclined plate settling separation zone along the vertical direction. The inclined plate 13 is downwardly inclined at an angle of 60° with the inner cylinder 21, so as to facilitate the downward settlement of large-particle pollutants along the slope. The inner cylinder 21 in the inclined plate settling separation zone is internally provided with an intermediate pool. A plurality of water outlets are uniformly distributed from the top of the side wall of the intermediate pool to the top of the inclined plate. The water flow flows into the water outlets along the bottom surface of the inclined plate, and then flows into the intermediate pool from the water outlets. The bottom of the intermediate pool is provided with a drain pipe.

[0047] The inclined plate settling separation zone is below the sewage discharge zone. The top of the sewage discharge zone is provided with an interceptor 16, and the bottom of the interceptor 16 is provided with a sludge pool 17. The large-particle pollutants that are settled on the top of the interceptor through the inclined plate are further dewatered and then settled at the bottom of the interceptor. After the static settlement of the sludge and water, the water is in the upper layer and the sludge is in the lower layer. The interceptor applies the principle of micro-gravity to achieve the purposes of sludge and water diversion, solid-liquid separation and sludge concentration. The interceptor is provided with a water inlet branch pipe 20 corresponding to the sludge pool 17 and a sewage discharge pipe. The water inlet branch pipe 20 and the sewage discharge pipe are both provided with a sewage valve 19. The water inlet branch pipe is used to flush away the sludge in the sludge pool at regular intervals. The sludge is immediately flushed away when the accumulated sludge does not exceed the set amount. The sewage valve is used to control the discharge of the slurry mixture after flushing through the drain pipe; as shown in the figure, Figure 6 The water inlet branch pipe 20 is a branch pipeline of the water inlet pipe 1. The flushing end of the water inlet branch pipe 20 is also provided with an elbow. The elbow utilizes the power of the water inlet, and does not need to be additionally designed to increase the flushing water. Example 2

[0048] The application is based on natural scientific principles such as chemical flocculation, fluid mechanics, gas buoyancy and Newton's gravity, and proposes a working method of AEPCFU automatic cyclone gas floatation integrated module, including the following steps:

[0049] The water inlet pipe 1 is connected to water inlet, and according to the water quality, flocculants are selectively added to the pipe mixer 2, the water outlet of the water inlet pipe 1 is discharged from the elbow, and the cyclone is formed in the annular column between the inner cylinder 21 and the outer cylinder 4, the elbow utilizes the power of the water inlet, and does not need to additionally design flushing water, and the cyclone can rotate along the outer wall of the inner cylinder without resistance;

[0050] The purpose of the cyclone is to make the water pressure distribution uniform, promote flocculation, and balance the water pressure, so that the stirring time is saved; the water supply device 7 supplies water to the gas-liquid mixer 8, and the gas supply device 6 supplies gas to the water supply pipe from the side wall opening of the water supply pipe before the water supply enters the gas-liquid mixer 8 along the water supply pipe (in the oil exploitation industry, the gas supplied by the gas supply device is nitrogen or natural gas; in other water treatment projects, the gas supplied by the gas supply device is compressed air), and the gas stirring is carried out in the water supply pipe to obtain the gas-liquid mixture, so as to create better conditions for entering the solid-liquid floatation separation zone; the part of the treated water generated by the gas floatation in the annular column between the outer cylinder 4 and the inner cylinder 21 is pumped into the water supply device 7 and the gas supply device 6 by the reflux pump, the gas supply device 6 supplies compressed gas and water solution with pressure to the gas-liquid mixer 8, and the mixture is reused to the front of the gas supply device 6, and the compressed gas and water solution with pressure are supplied to the gas-liquid mixer 8 through the gas supply device 6 and the pipe;

[0051] The gas-liquid mixture is discharged from the gas release device in the side wall of the gas-liquid mixer 8 in the form of micro-bubbles, and the average particle size of the micro-bubbles is 10 μm; the micro-bubbles adsorb small particle floating sludge and accelerate floatation instantaneously, enter the solid-liquid floatation separation zone, and the micro-bubbles with small particle floating sludge overflow along the side wall of the sludge collecting disc 9 into the bottom of the sludge collecting disc 9 and gradually defoam, and the sludge is discharged from the sludge discharge port 14; the gas generated by the defoaming of the micro-bubbles is discharged from the gas discharge hole 11 at the top of the outer cylinder 4; after the gas generated by the defoaming of the micro-bubbles is discharged from the gas discharge hole 11 on the top wall of the outer cylinder 4, it is recycled to the water supply pipe connected with the pipe mixer, the gas discharged from the top of the whole device has a certain micro-positive pressure, and the micro-positive pressure gas discharged from the gas discharge hole can be utilized to dissolve gas in the water supply pipe, carry out gas stirring to promote gas-liquid mixing, generate gas-liquid mixture, and make more floating sludge float rapidly after the gas-liquid mixture enters the floatation separation zone;

[0052] At the same time that the micro-bubbles adsorb small particle floating sludge and accelerate floatation instantaneously, the large particle pollutants in the water inlet sink downward to the inclined plate 13, the large particle pollutants meet the inclined plate 13 and deposit, the water flow enters the middle pool from the middle hole along the slope of the inclined plate, and the water flow is discharged from the drain pipe at the bottom of the middle pool;

[0053] The large-particle pollutants are settled along the slope of the inclined plate 13 to the top of the interceptor 16, the interceptor 16 further dehydrates the large-particle pollutants, and then the sludge is settled into the sludge pool 17 below the interceptor 16; after the static settlement of the sludge-water, the water is in the upper layer and the sludge is in the lower layer, the interceptor applies the microgravity principle to separate the sludge-water, separate the solid-liquid and concentrate the sludge; the water inlet pipe 1 is connected with the sludge pool 17 through the water inlet pipe branch 20, the sludge in the sludge pool 17 is washed away regularly, and the sludge is washed away immediately when the sludge accumulation is not more than the set amount, and the mixed solution of the washed sludge and water is discharged by the sludge discharge pipe under the control of the sludge discharge valve 19.

[0054] Embodiment 1 and Embodiment 2 are mainly used in the oil exploitation industry; compared with the CFU system of the ESI company in Houston, USA, the related performance parameters of the AEPCFU system used in Embodiment 1 and Embodiment 2 of the present application are compared as shown in Table 1.

[0055] Table 1 Comparison of performance parameters of the AEPCFU system of the present application and the existing CFU system

[0056]

[0057] As can be seen from the above, the device of the present application has small land occupation, low investment and operation cost; the dissolved gas pump with a pressure of about 0.3 MPa is used, and the power consumption is low; the water-gas positive pressure mixing method is used, and the amount of dissolved gas is large; the oil-water separation efficiency is above 95%, and the oil-water separation efficiency is high.

Claims

1. An AEPCFU (Automatic Swirl Air Flotation) integrated module, characterized in that, include: The outer cylinder (4), inner cylinder (21), flocculation reaction zone, swirling water distribution zone, solid-liquid flotation separation zone, micro-positive pressure gas-liquid separation zone, inclined plate sedimentation separation zone and sewage discharge zone; the inner cylinder (21) is vertically installed inside the outer cylinder (4), the inner cylinder (21) is coaxial with the outer cylinder (4), the height of the inner cylinder (21) is lower than that of the outer cylinder (4), the side wall of the inner cylinder (21) is a cylindrical support structure (5); the inner cylinder (21) is a hollow device; The annular column between the outer cylinder (4) and the inner cylinder (21) forms a micro-positive pressure gas-liquid separation zone, a swirling water distribution zone, a solid-liquid flotation separation zone, an inclined plate sedimentation separation zone, and a sewage discharge zone from top to bottom; The flocculation reaction zone is located at the water inlet end of the outer cylinder (4). The flocculation reaction zone is equipped with a water inlet pipe (1) and a pipe mixer (2). The water inlet pipe (1) is connected to the water inlet end of the pipe mixer (2), and the water outlet end of the pipe mixer (2) is connected to a water pipe. The water inlet pipe passes through the outer cylinder (4) and enters the vortex water distribution zone. The water outlet direction of the water pipe extending into the vortex water distribution zone is the tangential direction of the outer cylinder (4). The water pipe extending into the vortex water distribution zone has an elbow. An air supply device (6) and a water supply pipe are provided below the flocculation reaction zone on the outer side of the outer cylinder (4). The upper side opening of the water supply pipe is connected to the air supply device (6). A gas-liquid mixer (8) is provided in the inner cylinder (21). The water supply pipe extends into the outer cylinder (4) and is connected to the liquid inlet of the gas-liquid mixer (8). An exhaust release device is evenly provided on the side wall of the gas-liquid mixer (8). The water supply pipe connected to the air supply device (6) is also connected to a water supply device (7). The water supply device (7) is connected to a branch pipe (20) of the water inlet equipped with an automatic flushing valve. In the solid-liquid flotation separation zone, a communicating vessel (10) for discharging reaction gas and liquid is provided on a plane that is flush with the top of the inner cylinder (21) and the outer cylinder (4); a slag collection plate (9) is provided on the top of the inner cylinder (21), and the height of the top of the slag collection plate (9) is lower than the height of the communicating vessel (10); a slag discharge port (14) is provided in the center of the slag collection plate (9), and the slag discharge port (14) is connected to the slag discharge pipe (15); the outlet end of the slag discharge pipe (15) extends to the outside of the outer cylinder (4); The top of the gas-liquid mixer (8) extends into the exhaust liquid pipe, which is equipped with a liquid level control valve (12). The top wall of the outer cylinder (4) is provided with an exhaust hole (11). The exhaust hole (11) is connected to the water supply pipe connected to the pipeline mixer (2) by the gas transmission pipe, and the connection point is located after the pipeline mixer (2). The inner cylinder (21) at the bottom of the gas-liquid mixer (8) is provided with an inclined plate settling separation zone on its side. One or two inclined plates (13) are provided in the inclined plate settling separation zone along the vertical direction. The inner cylinder (21) in the inclined plate settling separation zone is an intermediate pool. Multiple water outlet holes are opened from the top of the side wall of the intermediate pool to the top of the inclined plate. A drain pipe is provided at the bottom of the intermediate pool. The inclined plate (13) and the inner cylinder (21) form a downward angle of 45° to 60°. Below the inclined plate sedimentation separation zone is the sewage discharge zone. An interceptor (16) is installed at the top of the sewage discharge zone, and a sludge tank (17) is installed at the bottom of the interceptor (16). A water inlet branch pipe (20) and a sewage discharge pipe are provided corresponding to the sludge tank (17). A sewage discharge valve (19) is provided on both the water inlet branch pipe (20) and the sewage discharge pipe. The water inlet branch pipe (20) is a branch pipe of the water inlet pipe (1). An elbow (3) is also provided at the flushing end of the water inlet branch pipe (20).

2. The AEPCOFU automatic swirl air flotation integrated module according to claim 1, characterized in that: The slag discharge pipe (15) is located in the space at the bottom of the gas-liquid mixer (8) in the inner cylinder (21).

3. The AEPCOFU automatic swirl air flotation integrated module according to claim 1, characterized in that: The lower periphery of the communicating vessel (10) is fixed with a figure-eight shaped ramp.

4. A method for operating the AEPCOFU automatic swirl air flotation integrated module as described in any one of claims 1 to 3, characterized in that, Includes the following steps: The inlet pipe (1) is connected to the water inlet. Depending on the water quality, flocculant is selectively added to the pipe mixer (2). The water outlet of the inlet pipe (1) is discharged from the elbow and forms a vortex in the annular column between the inner cylinder (21) and the outer cylinder (4). Before the water supply enters the gas-liquid mixer (8) along the water supply pipe, the gas supply device (6) supplies gas to the water supply pipe from the upper side opening of the water supply pipe, and agitates the water supply in the water supply pipe to obtain a gas-liquid mixture; in the oil extraction industry, the gas supplied by the gas supply device (6) is nitrogen or natural gas; in other water treatment projects, the gas supplied by the gas supply device (6) is compressed air. The gas-liquid mixture is distributed to the gas-liquid mixer (8) and discharged in the form of microbubbles from the exhaust release device on the side wall of the gas-liquid mixer (8). The microbubbles adsorb small particles of scum and accelerate their floating instantly. They overflow into the bottom of the scum collection pan (9) along the side wall and gradually defoam. The scum is discharged from the discharge port (14). The gas generated by the microbubble defoaming is discharged from the exhaust hole (11) at the top of the outer cylinder (4). After the gas generated by the microbubble defoaming is discharged from the exhaust hole (11) on the top wall of the outer cylinder (4), it is recovered to the water supply pipe connected to the pipeline mixer through the gas transmission pipeline. The gas discharged from the top of the entire device has a certain positive pressure. The gas with a certain positive pressure discharged from the exhaust hole can be used to dissolve gas in the water supply pipe, and gas stirring is carried out to promote gas-liquid mixing and generate gas-liquid mixture. After the gas-liquid mixture enters the flotation separation zone, more scum can float up quickly. Large particulate pollutants in the influent settle downwards to the inclined plate (13), and the water flows along the bottom surface of the inclined plate through the outlet hole into the intermediate pool and is discharged from the drain pipe (18) on the side of the intermediate pool. Before the water produced by air flotation in the annular column between the outer cylinder (4) and the inner cylinder (21) is pumped into the water supply device (7) and the air supply device (6) by the return pump, the air supply device (6) supplies compressed gas and pressurized aqueous solution to the gas-liquid mixer (8). Large particulate pollutants settle down along the slope of the inclined plate (13) to the top of the interceptor (16). After the interceptor (16) further dewaters the large particulate pollutants, the sludge settles into the sludge tank (17) below the interceptor (16). The water inlet of the inlet pipe (1) enters the sludge tank (17) from the branch pipe (20) of the inlet pipe. The sludge in the sludge tank (17) is washed away periodically. The sludge-water mixture after washing is discharged from the sludge discharge pipe under the control of the drain valve (19).

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