CN212799928U - Multi-stage dissolved air flotation device for oily sewage treatment - Google Patents
Multi-stage dissolved air flotation device for oily sewage treatment Download PDFInfo
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- CN212799928U CN212799928U CN202021056607.9U CN202021056607U CN212799928U CN 212799928 U CN212799928 U CN 212799928U CN 202021056607 U CN202021056607 U CN 202021056607U CN 212799928 U CN212799928 U CN 212799928U
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Abstract
The utility model relates to a multistage dissolved air flotation device for oily sewage treatment belongs to oily sewage treatment technical field. The method comprises the following steps: the device comprises a first air flotation tank body, a second air flotation tank body, an oily sewage water inlet perforated pipe, a dissolved air pump and an air-liquid separation tank, wherein the outlet of the dissolved air pump is connected with the inlet of the air-liquid separation tank, the outlet of the dissolved air pump is respectively connected with the two air flotation tank bodies through two dissolved air release pipes, and the first dissolved air release pipe is inserted into the oily sewage water inlet perforated pipe to form a sleeve; a first water production tank and a flocculation reaction area formed by a water inlet baffle are arranged between the two air flotation tank bodies. The utility model discloses a multistage air supporting device that dissolves compares traditional air supporting pond dissolved air releaser and has both saved area, has improved mixed effect again, and bubble and oil droplet fully contact have promoted the separation effect of oil droplet. The device has the advantages of stable long-term operation, high economic benefit of equipment and the like.
Description
Technical Field
The utility model relates to a multistage dissolved air flotation device for oily sewage treatment belongs to oily sewage treatment technical field.
Background
The oil and gas industry produces a large volume of oily wastewater from oil recovery processes, sludge cleaning processes, oil and gas processing processes, and the like. The produced water in the oil field exploitation industry mainly contains crude oil, suspended matters and the like, and if the produced water is not effectively treated, the produced water is reinjected into the oil field again to cause formation blockage when being exploited, so that the oil yield of the oil field is reduced. Oily sewage generated by oil sludge cleaning and petroleum and natural gas processing can destroy the ecological environment if the oily sewage is not treated in a standard discharge water body.
The existing oily sewage in the petroleum and natural gas industry usually adopts a first-stage dissolved air horizontal flow type air floatation tank to remove oil and suspended matters, and the efficiency of removing the oil and the suspended matters is not high. The adopted air dissolving system is also a traditional air dissolving system, generally comprises an air compressor, a static mixer, a large air dissolving tank and the like, and occupies a relatively large area.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multistage dissolved air flotation device for oily sewage treatment improves and innovates existing profit sewage treatment plant's structure, adopts the first order swash plate air supporting pond that does not add chemical agent, is used for retrieving or getting rid of oil and getting rid of the suspended solid specially, adopts the second grade again to add the coagulant for further deoiling and getting rid of the suspended solid, so that provide sufficient effective area on limited plane and remove the deoiling.
The utility model provides a multistage dissolved air flotation device for oily sewage treatment, include: the device comprises a first air flotation tank body, a second air flotation tank body, an oily sewage water inlet perforated pipe, a dissolved air pump and an air-liquid separation tank, wherein the outlet of the dissolved air pump is connected with the inlet of the air-liquid separation tank; a first water production tank and a flocculation reaction area formed by a water inlet baffle are arranged between the first air flotation tank body and the second air flotation tank body, the first air flotation tank body is communicated with the first water production tank through a first water collecting perforated pipe, the tail part of the second air flotation tank body is provided with a second water production tank, the second water production tank is communicated with the second water production tank through a second water collecting perforated pipe, and the second water production tank is provided with a discharge port and a produced water return port;
a first stainless steel inclined plate is arranged in the first air floating box body, a first multi-bucket sludge settling groove is formed in the bottom of the first air floating box body, a first slag scraper is arranged at the top of the first air floating box body, and a first slag discharging groove is formed in the rear part of the first slag scraper through a first baffling guide plate; the tail part of the first air floating box body is provided with a first water collecting perforated pipe, and a first water outlet liquid level regulating valve is arranged on the first water collecting perforated pipe;
the first water production tank is connected with the flocculation reaction zone, a coagulant adding pipe is arranged at the inlet of the flocculation reaction zone, and the flocculation reaction zone is provided with a stirring impeller;
a second stainless steel inclined plate is arranged at the middle upper part in the second air flotation tank body, a second multi-bucket sludge settling groove is arranged at the bottom of the second air flotation tank body, a second slag scraper is arranged at the top of the second air flotation tank body, and a second slag discharging groove is formed at the rear part of the second slag scraper through a second baffling guide plate;
the second water production tank is communicated with the second air flotation tank body through a second water collecting perforated pipe, and a second water outlet liquid level regulating valve is arranged on the second water collecting perforated pipe.
In the multi-stage dissolved air flotation device for treating the oily sewage, the first dissolved air release pipe and the second dissolved air release pipe have the same structure and are double rows of perforated pipes, the two rows of holes are symmetrically arranged, and outlets of the two rows of holes are arranged at 180 degrees.
In the multi-stage dissolved air flotation device for treating oily sewage, the inlets of the first dissolved air release pipe and the second dissolved air release pipe are respectively provided with a valve so as to adjust the proportion of dissolved air water entering the first air flotation tank body and the second air flotation tank body.
The utility model provides a multistage dissolved air flotation device for oily sewage treatment, its advantage is:
1. the utility model discloses an among the multistage dissolved air flotation device for oily sewage treatment, dissolved air water adopts dissolved air release pipe release, the release pipe is double perforated pipe, oily sewage intake perforated pipe (being the outer tube) and first dissolved air release pipe (being the inner tube) constitute the sleeve pipe in the first flotation tank body, dissolved air water and oily sewage intensive mixing in the sleeve pipe, compare traditional air supporting pond dissolved air releaser and both saved area, the mixed effect has been improved again, bubble and the abundant contact of oil pearl have promoted the separation effect of oil pearl.
2. In the device, the air floatation separation areas of the first air floatation box body and the second air floatation box body are respectively provided with the parallel stainless steel inclined plates, so that the oil drop floating area is increased, and the removal efficiency is improved. The first-stage inclined plate air floatation tank is not added with chemical agents and is specially used for recovering or removing pure oil and removing large-particle suspended matters; and coagulant is added in the second stage for further oil removal and small particle suspended matter removal. The oil is separated in two stages, no chemical agent is added in the first stage, so that purer oil is obtained, and coagulant is added in the second stage again to ensure that residual oil and suspended matters are combined into large oil drops or large flocs through flocculation, so that the efficiency of second-stage air floatation is improved, the quality of discharged water is greatly ensured, and finally the quality of the discharged water is far higher than that of the discharged water in a traditional first-stage advection air floatation tank. The stainless steel inclined plate is adopted instead of a plastic inclined plate or an inclined pipe, so that the cleaning and corrosion prevention of the inclined plate are facilitated, and the stability of long-term operation is guaranteed.
3. In this device, the import of first dissolved air release pipe and second dissolved air release pipe all is equipped with the valve, can adjust the distribution proportion of dissolved air water between first air supporting box body and second air supporting box body. The perforated water collecting pipe is arranged at the middle lower part of the tail part of the air floatation tank, and clear water at the lower layer of the air floatation tank flows into the water production tank through the perforated water collecting pipe. As an improvement, the bottom of the air floatation tank is provided with a multi-bucket sludge settling tank (V-shaped tank), so that the settled sludge smoothly slides in without arranging a sludge scraper. The side plate of the mud settling tank is provided with a mud outlet, and the mud can be pumped out for dehydration treatment through an external sludge pump. As an improvement, the water outlet liquid level adjusting device is formed by sleeving a large pipe with a small pipe (in a sleeve type design), the large pipe is a movable pipe, the small pipe is a fixed pipe, the large pipe and the small pipe are sealed by a rubber ring, so that water leakage is ensured, and outlet water overflows from the top of the large pipe and enters a water production tank; the upper part of the water outlet liquid level adjusting device is provided with a lead screw which can lift the height of the large pipe, thereby controlling the liquid level of the air floating box body. As an improvement, a baffling guide plate which is convenient for floating oil to flow in is arranged at the inlet of the slag discharging groove, so that the floating oil is favorably scraped in smoothly. The slag notch is installed on one side curb plate, for the convenience of the smooth outflow of oil slick, and the slag notch bottom plate is arranged downwards along the slope of the orientation of producing oil. The first slag notch is fed with a major portion of oil and less suspended solids, and the second slag notch is fed with a minor amount of a mixture of oil and suspended solids. The two-stage air flotation tank and the two slag discharging grooves are arranged, so that the floating oil in the first-stage slag discharging groove can be recycled, and the economic benefit of equipment use is improved.
Drawings
FIG. 1 is a schematic structural diagram of a multi-stage dissolved air flotation device for oily sewage treatment according to the present invention.
Fig. 2 is a sectional view a-a of fig. 1.
FIG. 3 is a schematic view of the first and second dissolved air releasing tubes of the apparatus shown in FIG. 1.
Fig. 4 is a schematic view showing the structure of a water inlet perforated pipe for oily water in the apparatus shown in fig. 1.
In FIGS. 1 to 4, 1 is a first air bearing tank body, 2 is a second air bearing tank body, 3 is a first slag scraping machine, 4 is a second slag scraping machine, 5 is an oily sewage inlet perforated pipe, 6 is a dissolved air pump, 7 is a gas-liquid separation tank, 8 is a first dissolved air releasing pipe, 9 is a second dissolved air releasing pipe, 10 is a first slag discharging tank, 11 is a first slag discharging port, 12 is a second slag discharging tank, 13 is a second slag discharging port, 14 is a first product water tank, 15 is a first effluent level regulating valve, 16 is a coagulant adding pipe, 17 is a stirring impeller, 18 is a flocculation reaction zone, 19 is a second effluent level regulating valve, 20 is a discharging port, 21 is a second product water tank, 22 is an exhaust valve, 23 is a first multi-bucket sludge settling tank, 24 is a first water collecting pipe, 25 is a first stainless steel inclined plate, 26 is a second stainless steel inclined plate, 27 is a second multi-bucket sludge tank, 28 is a second water collecting pipe, 29 is a first guide plate deflection baffle, 30 is a second baffling guide plate, 31 is a water inlet baffle plate, 32 is a sludge discharge port, and 33 is a produced water return port.
Detailed Description
The utility model provides a multistage dissolved air flotation device for oily sewage treatment, its structure is as shown in figure 1 and figure 2, a serial communication port, include: the structure of the first dissolved air release pipe 8 and the second dissolved air release pipe 9 with small holes on the pipe wall is shown in figure 3, the first dissolved air release pipe 8 is inserted into the oily sewage inlet perforated pipe 5 to form a sleeve, and the structure of the oily sewage inlet perforated pipe 5 is shown in figure 4; a first water production tank 14 and a flocculation reaction zone 18 formed by a water inlet baffle plate 31 are arranged between the first air flotation tank body 1 and the second air flotation tank body 2, the first air flotation tank body 1 is communicated with the first water production tank 14 through a first water collecting perforated pipe 24, a second water production tank 21 is arranged at the tail part of the second air flotation tank body 2, the second water production tank 21 is communicated with the second water production tank 21 through a second water collecting perforated pipe 28, and a discharge port 20 and a produced water return port 33 are arranged on the second water production tank 21;
a first stainless steel inclined plate 25 is arranged in the first air floating box body 1, a first multi-bucket sludge settling groove 23 is arranged at the bottom of the first air floating box body 1, a first slag scraper 3 is arranged at the top of the first air floating box body 1, and a first slag discharging groove 10 is formed at the rear part of the first slag scraper 3 through a first baffling guide plate 29; the tail part of the first air floating box body 1 is provided with a first water collecting perforated pipe 24, and the first water collecting perforated pipe 24 is provided with a first water outlet liquid level regulating valve 15;
the first water production tank 14 is connected with a flocculation reaction zone 18, a coagulant adding pipe 16 is arranged at the inlet of the flocculation reaction zone 18, and a stirring impeller 17 is arranged in the flocculation reaction zone 18;
a second stainless steel inclined plate 26 is arranged at the middle upper part in the second air floating box body 2, a second multi-bucket sludge settling groove 27 is arranged at the bottom of the second air floating box body 2, a second slag scraper 4 is arranged at the top of the second air floating box body 2, and a second slag discharging groove 12 is formed at the rear part of the second slag scraper 4 through a second baffling guide plate 30;
the second water production tank 21 is communicated with the second air floating tank body 2 through a second water collecting perforated pipe 28, and a second water outlet level regulating valve 19 is arranged on the second water collecting perforated pipe 28.
In the device, the first dissolved air releasing pipe and the second dissolved air releasing pipe have the same structure and are double-row perforated pipes, as shown in fig. 3, two rows of holes are symmetrically arranged, and outlets of the two rows of holes are arranged at 180 degrees.
In the device, the inlets of the first dissolved air release pipe and the second dissolved air release pipe are respectively provided with a valve so as to adjust the proportion of the dissolved air water entering the first air floating box body and the second air floating box body. The dissolved air water generated by the dissolved air pump is constant, the inlets of the first dissolved air release pipe and the second dissolved air release pipe are respectively provided with a valve, the valve of the first dissolved air release pipe is opened a little bit, and the valve of the second dissolved air release pipe is opened a little bit, so that the dissolved air water entering the first air floating box body is more, and the dissolved air water entering the second air floating box body is less. I.e. by the opening of both valves.
The utility model discloses an among the multistage gas dissolving air supporting device, first baffling baffle 29 is installed to the entrance of first slag notch 10, and first slag notch 11 is installed on a side board, and the slag notch bottom plate can be arranged downwards to the slag notch slope. The second baffling guide plate 30 is installed at the entrance of the second slag notch 12, the second slag notch 13 is installed on a side plate, and the bottom plate of the slag notch can be arranged downwards in a tilting manner.
The technical solution of the present invention will be further described in detail through the following embodiments and the accompanying drawings.
As shown in fig. 1 to 3, the multi-stage dissolved air flotation device of the present embodiment includes a first air flotation tank 1 and a second air flotation tank 2 connected to a dissolved air generating mechanism, where the dissolved air generating mechanism includes a dissolved air pump 6 and an air-liquid separation tank 7. The dissolved air pump 6 sucks in produced water from a produced water return port 33 of the second produced water tank 21, an air pipe of a pump head of the dissolved air pump 6 sucks in air, an impeller of the pump body cuts the air into small bubbles, air and water are mixed, the small bubbles enter the gas-liquid separation tank 7 from an outlet of the dissolved air pump 6, and undissolved gas is discharged from an exhaust valve 22 at the top of the gas-liquid separation tank 7. The gas-liquid separation tank 7 is respectively connected with a first dissolved gas release pipe 8 of the first buoyancy tank body 1 and a second dissolved gas release pipe 9 of the second buoyancy tank body 2. The first dissolved air release pipe 8 and the second dissolved air release pipe 9 are double-row perforated pipes, two rows of holes are symmetrically arranged, two rows of hole outlets are arranged at 180 degrees, the inlets of the first dissolved air release pipe 8 and the second dissolved air release pipe 9 are provided with valves, and the distribution proportion of dissolved air water between the first air floating box body 1 and the second air floating box body 2 can be adjusted. The first dissolved air releasing pipe 8 and the water inlet perforated pipe 5 of the oily sewage form a sleeve, the dissolved air water releases micro bubbles (20-30 microns) to be fully mixed with the oily sewage in the sleeve, oil droplets are fully contacted with the bubbles and flow out of the sleeve to enter an air floatation separation zone, the oil droplets with large particle diameters float upwards to the water surface, suspended matters and small oil droplets enter a first stainless steel inclined plate 25 along with water flow to be separated, the small oil droplets float upwards to the water surface through inclined plate separation, and the suspended matters with large particles are separated and sunk into a first multi-bucket sludge settling tank 23. The oil floating to the water surface in the first air floating box body 1 is scraped to the first slag discharging groove 10 through the first slag scraper 3. The first slag notch 10 is located at the rear part of the first air flotation tank body 1, and a first baffling guide plate 29 which is convenient for floating oil to flow in is arranged at the inlet of the first slag notch; the first slag hole 11 is installed on a side plate, and in order to facilitate smooth outflow of floating oil, a bottom plate of the first slag notch 10 is obliquely arranged downwards along the oil outlet direction. The water which is subjected to air floatation oil removal and suspended matter removal in the first air floatation tank body 1 is collected through a first water collecting perforated pipe 24, a first water outlet liquid level adjusting device 15 is arranged, the first water outlet liquid level adjusting device 15 is formed by sleeving a large pipe with a small pipe (sleeve type design), the large pipe and the small pipe are sealed through a rubber ring, the large pipe is a movable pipe, the small pipe is a fixed pipe, and the outlet water overflows from the top of the large pipe and enters a first water production tank 14; the upper part of the first water outlet liquid level adjusting device 15 is provided with a lead screw which can lift the height of the large pipe, so that the liquid level of the first air bearing box body 1 is controlled.
The first effluent of producing water tank 14, flow into the flocculation reaction district 18 of 2 heads of second flotation tank, flocculation reaction district 18 import department establishes into water baffle 31, make the rivers direction downward, avoid appearing the short-term current, set up coagulant in baffle 31 department simultaneously and throw feeder tube 16, coagulant solution mixes the back with the first effluent of producing water tank 14, get into flocculation reaction district 18, stir through impeller 17 and carry out flocculation reaction, the suspended solid of aquatic tiny particle is through flocculating formation large granule floc, some emulsified oil in the aquatic are broken emulsion under the effect of coagulant, become the oil droplet of easily air supporting separation. The water that goes out of flocculation reaction zone 18 contacts with the gas-dissolved water of second gas-dissolved release pipe 9, bubble and oil drop, flocculating constituent contact, and rivers continue to flow backward, and direct come-up after partial oil drop and flocculating constituent and the bubble adhesion, and part and rivers get into second stainless steel swash plate 26, can continue to separate a part of oil drop and flocculating constituent of come-up in the swash plate district, and a small amount of big flocculating constituent sinks in the swash plate district, finally sinks to second multi-bucket silt basin 27. The oil and floc floating to the water surface in the second air flotation tank body 2 are scraped to the second slag discharging groove 12 through the second slag scraper 4. The second slag notch 12 is positioned at the rear part of the second air bearing box body 2, and a second baffling guide plate 30 which is convenient for scum to flow in is arranged at the inlet of the second slag notch; the second slag hole 13 is installed on one side plate, and in order to facilitate smooth outflow of dross, the bottom plate of the second slag notch 12 is arranged obliquely downward in the oil outlet direction. The water which is subjected to air floatation oil removal and suspended matter removal in the second air floatation tank body 2 is collected through a second water collecting perforated pipe 28, and is provided with a second water outlet liquid level adjusting device 19, the second water outlet liquid level adjusting device 19 is formed by sleeving a large pipe with a small pipe (in a sleeve type design), the large pipe and the small pipe are sealed through a rubber ring, the large pipe is a movable pipe, the small pipe is a fixed pipe, and the outlet water overflows from the top of the large pipe and enters a second water production tank 21; the upper part of the second water outlet liquid level adjusting device 19 is provided with a lead screw which can lift the height of the large pipe, thereby controlling the liquid level in the second air bearing box body 2. The produced water is finally discharged through the discharge port 20. The sludge in the multi-bucket sludge settling tank is discharged through a plurality of sludge settling discharge ports 32 at the lower part of the sludge settling tank.
The utility model discloses an each single-piece equipment all is the product sold in the market.
The multi-stage dissolved air flotation device provided by the utility model is described in detail above, and the principle and the implementation mode of the utility model are explained by applying specific examples, and the description of the above examples is only used for helping to understand the core idea of the utility model; meanwhile, for a person skilled in the art, there are changes to the specific embodiments and applications according to the idea of the present invention, and these changes should be included in the protection scope of the appended claims. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (3)
1. A multistage dissolved air flotation device for oily sewage treatment is characterized by comprising: the device comprises a first air flotation tank body, a second air flotation tank body, an oily sewage water inlet perforated pipe, a dissolved air pump and an air-liquid separation tank, wherein the outlet of the dissolved air pump is connected with the inlet of the air-liquid separation tank; a first water production tank and a flocculation reaction area formed by a water inlet baffle are arranged between the first air flotation tank body and the second air flotation tank body, the first air flotation tank body is communicated with the first water production tank through a first water collecting perforated pipe, the tail part of the second air flotation tank body is provided with a second water production tank, the second water production tank is communicated with the second water production tank through a second water collecting perforated pipe, and the second water production tank is provided with a discharge port and a produced water return port;
a first stainless steel inclined plate is arranged in the first air floating box body, a first multi-bucket sludge settling groove is formed in the bottom of the first air floating box body, a first slag scraper is arranged at the top of the first air floating box body, and a first slag discharging groove is formed in the rear part of the first slag scraper through a first baffling guide plate; the tail part of the first air floating box body is provided with a first water collecting perforated pipe, and a first water outlet liquid level regulating valve is arranged on the first water collecting perforated pipe;
the first water production tank is connected with the flocculation reaction zone, a coagulant adding pipe is arranged at the inlet of the flocculation reaction zone, and the flocculation reaction zone is provided with a stirring impeller;
a second stainless steel inclined plate is arranged at the middle upper part in the second air flotation tank body, a second multi-bucket sludge settling groove is arranged at the bottom of the second air flotation tank body, a second slag scraper is arranged at the top of the second air flotation tank body, and a second slag discharging groove is formed at the rear part of the second slag scraper through a second baffling guide plate;
the second water production tank is communicated with the second air flotation tank body through a second water collecting perforated pipe, and a second water outlet liquid level regulating valve is arranged on the second water collecting perforated pipe.
2. The apparatus as claimed in claim 1, wherein said first dissolved air releasing tube and said second dissolved air releasing tube are identical in structure and are perforated in two rows of holes, the holes in the two rows being symmetrically arranged and the outlets in the two rows being arranged at 180 degrees.
3. The apparatus of claim 1, wherein the inlets of the first and second dissolved air release conduits are each provided with a valve to regulate the ratio of dissolved air water entering the first and second flotation tanks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021056607.9U CN212799928U (en) | 2020-06-10 | 2020-06-10 | Multi-stage dissolved air flotation device for oily sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021056607.9U CN212799928U (en) | 2020-06-10 | 2020-06-10 | Multi-stage dissolved air flotation device for oily sewage treatment |
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| Publication Number | Publication Date |
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| CN212799928U true CN212799928U (en) | 2021-03-26 |
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| CN202021056607.9U Active CN212799928U (en) | 2020-06-10 | 2020-06-10 | Multi-stage dissolved air flotation device for oily sewage treatment |
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| CN (1) | CN212799928U (en) |
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