CN114835280A - Multifunctional pretreatment device and pretreatment method for complex waste liquid of oil and gas field - Google Patents
Multifunctional pretreatment device and pretreatment method for complex waste liquid of oil and gas field Download PDFInfo
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- CN114835280A CN114835280A CN202110140465.7A CN202110140465A CN114835280A CN 114835280 A CN114835280 A CN 114835280A CN 202110140465 A CN202110140465 A CN 202110140465A CN 114835280 A CN114835280 A CN 114835280A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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Abstract
The invention provides a multifunctional pretreatment device and a pretreatment method for complex waste liquid in an oil and gas field, wherein the multifunctional pretreatment device for complex waste liquid in the oil and gas field is characterized in that a waste liquid incoming water pipeline is connected with a pipeline mixer through a lift pump, the pipeline mixer is sequentially connected with an air-entrapping flocculation device and a reinforced flocculation separation device through pipelines, a first dosing device and a second dosing device are respectively connected with the input end and the output end of the pipeline mixer through a first dosing pipeline and a second dosing pipeline, and are respectively connected with a first reaction chamber and a second reaction chamber of the reinforced flocculation separation device through a third dosing pipeline and a fourth dosing pipeline, the third dosing device is communicated with the first reaction chamber through a fifth dosing pipeline, each dosing pipeline is provided with a valve, the air-entrapping flocculation device carries out microbubble gel breaking, aeration oxidation, flocculation and sedimentation treatment on the waste liquid, and the reinforced flocculation separation device carries out dissolved air floatation, floating oil collection, chemical oxidation and clarification on the waste liquid, And (4) flocculating, performing inclined plate sedimentation and discharging after re-floating oil collection. Therefore, the process flow can be optimized to meet the treatment requirements of waste liquids with different properties.
Description
Technical Field
The invention relates to the field of complex waste liquid treatment of oil and gas fields, in particular to a multifunctional pretreatment device and a pretreatment method for complex waste liquid of an oil and gas field.
Background
Along with the development of oil fields, the components of the generated waste liquid are more and more complex, and the properties of the waste liquid are more and more changeable, so that the standard treatment difficulty of the waste liquid is continuously increased. In addition, the composition of each drilling fracturing fluid varies due to the different formation fracturing conditions, which also presents a challenge to the adaptability of the produced water treatment process to treat different water qualities. In addition, each large oil field has gradually increased development force on remote small blocks, but the geographical position of the remote small blocks is remote, so that the produced water is less, the produced water is mostly intermittent and discontinuous, and the treatment cost is high if the produced water is transported to a centralized treatment station by pulling or pipes. In view of the above situation, if a single pretreatment technology is adopted, different pretreatment methods need to be selected according to different properties of waste liquid (including produced water), and the single pretreatment method generally cannot meet the treatment requirements of complex waste liquid and cannot achieve a good treatment effect, so different pretreatment processes need to be combined according to different properties of waste liquid to form a combined process. The combined process flows of gravity oil removal, coagulation sedimentation, dissolved air floatation, filtration and the like which are widely adopted in the prior oil field waste liquid treatment process are combined, so that the process flow is long, the scale of a process device is large, skid-mounting is difficult, the applicability to treatment of the waste liquid which is difficult to degrade is not very strong, the water outlet effect is not ideal, and the applicability to treatment of scattered waste liquid in remote small blocks is poor. If the dosage of the chemical is increased to ensure the effluent quality, the usage amount of the chemical and the production amount of the sludge are increased, and the operation and disposal cost is increased.
In addition, referring to the related art of oil field waste liquid treatment, patent document No. 201620765032.5 discloses an oil and gas field wastewater platformization treatment system, which is a return well site, a buffer tank, a fracturing return liquid treatment system and a reuse water temporary storage tank which are connected in sequence, wherein the fracturing return liquid treatment system comprises an oxidation tank, a hardness removal tank, a flocculation settling device, a medium filter and a sludge treatment device which are connected in sequence, but the device has a complicated process flow, so that the device has a large scale, large operation cost investment and can not be skid-mounted, and is not suitable for treatment of scattered waste liquid of remote small blocks. Patent document No. 201310120660.9 discloses an oil and gas field wastewater treatment device and a treatment method thereof, which utilizes waste heat resources, directly contacts a wastewater heating system through a high-efficiency floating bed, wastewater is evaporated into steam through countercurrent contact with air, and then is condensed into purified water, and separated effective components are highly concentrated and can be recycled. Application number 201520937062.5's patent document discloses a portable skid-mounted oil gas field effluent treatment plant, and the device is equipped with air supporting chamber, filter chamber, disinfection room, gets rid of the oily substance in the waste water through the air supporting chamber, and the filter chamber is also better to the effect of getting rid of suspended solid, though the device scale is less, can the skid-mounted ization to have great cost advantage, but the device is not good to the adaptability of the relatively poor waste liquid of quality of water.
Therefore, designing a pretreatment device and a treatment method that can realize multiple pretreatment functions to satisfy waste liquid disposal processes of different properties, can be flexibly adjusted according to the variability of the properties of the waste liquid, have a small device scale, and can be used for treating scattered waste liquids in remote small blocks has become one of the problems to be solved in the field.
Disclosure of Invention
The technical problem to be solved by the technical scheme is how to provide an efficient treatment device and a treatment method which can meet the treatment process of waste liquid with different properties, have a compact internal structure and a small integral scale, and can realize the series process flows of multistage dosing coagulation, microbubble gel breaking, multistage oxidation, dissolved air floatation, sedimentation and dosing clarification so as to remove solid suspended matters, gel breaking, oil removal and degradation of different waste liquids.
In order to solve the technical problem, the technical scheme provides a multifunctional pretreatment device for complex waste liquid in an oil and gas field, which comprises: the system comprises a lift pump, a pipeline mixer, an air-entrapping flocculation device, a reinforced flocculation separation device, a first dosing device, a second dosing device and a third dosing device; wherein, the waste liquid comes the pump of water piping connection elevator pump to go into the end, the input of pipeline connection pipeline mixer is passed through to the pump-out end of elevator pump, pipeline connection air entrainment flocculation device's the end of intaking is passed through to pipeline connection air entrainment flocculation device's the end of intaking, the play water end connection drain pipe of strengthening flocculation separator, first charge device is through the pipeline of the input of first charge pipeline connection pipeline mixer and be provided with the valve on first charge pipeline, second charge device is through the pipeline of the output of second charge pipeline connection pipeline mixer and be provided with the valve on the second charge pipeline, first charge device still through the first reaction chamber of third charge pipeline intercommunication strengthening flocculation separator and be provided with the valve on the third charge pipeline, second charge device still through the second reaction chamber of fourth charge pipeline intercommunication strengthening flocculation separator and set up the valve on the fourth charge pipeline The third dosing device is communicated with the first reaction chamber of the reinforced flocculation separation device through a fifth dosing pipeline, and a valve is arranged on the fifth dosing pipeline; this air entrainment flocculation device can carry into its inside waste liquid carry out microbubble broken glue, aeration oxidation, flocculation and settlement behind the processing through the pipeline carry into strengthen inside the flocculation separator, strengthen the flocculation separator and can carry into its inside waste liquid of carrying into and carry out dissolved air flotation, oil slick collection, chemical oxidation, add medicine clarification, flocculation, swash plate subside and the oil slick is collected the back and is discharged through the drain pipe once more. Therefore, the integral structure of the pretreatment device can be optimized by serially applying the air-entrapping flocculation device and the reinforced flocculation separation device, so that the integral scale of the pretreatment device is reduced, and the high-efficiency operation of the waste liquid treatment process can be ensured; in addition, the pretreatment device can realize the flow processes of multistage dosing coagulation, multistage oxidation and dosing clarification by controlling valves on all dosing pipelines so as to meet the treatment requirements of waste liquids with different properties.
As another implementation of the technical solution, the air-entraining flocculation device comprises: the device comprises an outer cylinder, a treatment liquid discharge pipe, an inner cylinder, a bubble liquid inlet pipe, a water inlet ring pipe, at least one bubble generator pipeline and a sludge discharge pipe; the outer cylinder body is in a capsule shape and is vertically arranged, the upper end part of the outer cylinder body is provided with an exhaust hole communicated with the outside, the central position of the lower end part of the outer cylinder body is provided with a through hole and at least one treatment liquid outlet which surrounds the through hole, and the at least one treatment liquid outlet is connected with a treatment liquid discharge pipe; the inner cylinder and the outer cylinder are coaxial and are fixedly connected between the outer side surface of the inner cylinder and the inner side surface of the outer cylinder through a plurality of support rods, so that the inner cylinder is arranged in the outer cylinder, and intervals are formed between the outer side surface of the inner cylinder and the inner side surface of the outer cylinder, so that a settling space is formed; the inner cylinder body comprises a cylinder section, a waist-closing section and a funnel section from top to bottom, the upper end part of the cylinder section is an open opening, the inner side surface of the cylinder section is provided with a double-layer flow guide structure at intervals, the flow guide structure is composed of a plurality of flow deflectors, the transverse sections of which are uniformly arranged on the inner side surface of the cylinder section at intervals and are isosceles triangles, two equal waist edges of the transverse section of each flow deflector are in an inwards concave arc shape, the flow deflectors of the upper flow guide structure are staggered with the flow deflectors of the lower flow guide structure, the waist-closing section is combined with the lower end part of the cylinder section, the diameter of the middle part of the waist-closing section is smaller than that of the upper end part and the lower end part of the waist-closing section, the funnel section is combined with the lower end part of the waist-closing section, the diameter of the funnel section is gradually smaller from top to bottom, the lower end part of the funnel section is provided with a through hole corresponding to the through hole, a bubble liquid inlet pipe is combined with the through hole in a sealing way, and the upper end part of the bubble liquid inlet pipe is communicated with the through hole, the lower end part of the bubble liquid inlet pipe is positioned outside the through opening and is closed; the bubble liquid inlet pipe is provided with at least one waste liquid inlet corresponding to the at least one waste liquid outlet, at least one bubble generator pipeline is arranged between the at least one waste liquid outlet and the at least one waste liquid inlet in an indirect way, and the bubble generator pipeline is provided with a bubble generator; the bottom of the bubble liquid inlet pipe is also provided with a slag discharge port which is connected with a sludge discharge pipe. Therefore, the internal structure of the air-entrapping flocculation device is compact, the waste liquid treatment efficiency is high, and the micro-bubble gel breaking, aeration oxidation, rotational flow, vortex flocculation and sedimentation processes can be performed on the waste liquid conveyed into the air-entrapping flocculation device.
As another implementation of the technical solution, the reinforced flocculation separation device comprises, from the water inlet end to the water outlet end thereof: the device comprises a contact chamber, two oil residue chambers, a separation chamber, a first mixing chamber, a first reaction chamber, a second mixing chamber, a second reaction chamber, an inclined plate settling chamber and a clear water chamber; the contact chamber is connected with a waste liquid inlet pipe, the two oil residue chambers are respectively arranged at two sides of the contact chamber, the separation chamber is arranged at the other side of the contact chamber relative to the waste liquid inlet pipe, the separation chamber, the contact chamber and the two oil residue chambers are separated by a partition plate with the upper end part inclined towards the separation chamber, a first oil receiving groove is arranged above the contact chamber and at the position with the same height as the upper end part of the partition plate, two ends of the first oil receiving groove are respectively communicated with the upper parts of the two oil residue chambers, the waste liquid enters the separation chamber from the contact chamber through overflow, a first sludge hopper is formed at the bottom of the separation chamber, the first sludge hopper is provided with a sludge discharge pipe, the first mixing chamber, the first reaction chamber and the second mixing chamber are arranged at the other side of the separation chamber relative to the partition plate side by side, the separation chamber is communicated with the first mixing chamber through a flow channel, the first mixing chamber is communicated with the first reaction chamber through the flow channel, and the first reaction chamber is communicated with the second mixing chamber through the flow channel, and the first mixing chamber and the second mixing chamber are both provided with a stirring device, the second reaction chamber is arranged on the other sides of the first mixing chamber, the first reaction chamber and the second mixing chamber which are arranged side by side, the second reaction chamber is communicated with the second mixing chamber through a flow channel, the bottom of the second reaction chamber is provided with a second sludge hopper, the second sludge hopper is provided with a sludge discharge pipe, the inclined plate settling chamber is arranged on the other side of the second reaction chamber and is communicated with the inclined plate settling chamber through the flow channel, a second oil receiving groove is arranged above the inclined plate settling chamber, the clear water chamber is arranged on the other side of the inclined plate settling chamber, waste liquid enters the clear water chamber through overflow from the inclined plate settling chamber, the clear water chamber is connected with a water discharge pipe, the third and fifth dosing pipelines are both connected with the first reaction chamber, and the fourth dosing pipeline is connected with the second reaction chamber. Therefore, the reinforced flocculation separation device has a compact internal structure and high waste liquid treatment efficiency, and can carry out floating oil collection, chemical oxidation, dosing clarification, flocculation, inclined plate sedimentation and secondary floating oil collection on waste liquid conveyed into the reinforced flocculation separation device.
As another implementation of the technical scheme, sampling ports are arranged on the waste liquid water inlet pipeline, the waste liquid water inlet pipe and the waste liquid water outlet pipe, a return pipe is connected with the clear water chamber, and the return pipe is connected with the return port of the contact chamber through a dissolved air pump. Therefore, the waste liquid which does not reach the discharge standard can be reflowed to the contact chamber again through the backflow pipe and the dissolved air pump to be repeatedly subjected to enhanced flocculation separation treatment according to the standard reaching condition of the treated waste liquid detection, and meanwhile, the dissolved air floatation treatment can be performed on the waste liquid.
As another implementation of the technical scheme, the first dosing device is a coagulant dosing device, the second dosing device is a flocculant dosing device, and the third dosing device is a sodium hypochlorite dosing device.
In another embodiment of the present invention, a first branch bypass is connected to a pipeline from the pump-out end of the lift pump to the input end of the pipeline mixer, a second branch bypass is connected to a pipeline from the output end of the pipeline mixer to the water inlet end of the air-entrapping flocculation device, a third branch bypass is connected to a pipeline from the water outlet end of the air-entrapping flocculation device to the water inlet end of the enhanced flocculation separation device, valves are disposed on the first, second and third branch bypasses, and the first, second and third branch bypasses are communicated with each other. Therefore, the flow surpassing of the multifunctional pretreatment device for the complex waste liquid in the oil-gas field can be realized, and the treatment of the waste liquid is started from the pipeline mixer, the air-entrapping flocculation device or the reinforced flocculation separation device by controlling the valves on the first, second and third branch bypass paths according to the components and properties of the waste liquid; in addition, the flow surpasses and can be convenient for the overhaul and the maintenance of the pipeline mixer, the air-entrapping flocculation device and the related pipeline device.
As another implementation of the technical scheme, the lift pump, the pipeline mixer, the air-entrapping flocculation device, the reinforced flocculation separation device, the first dosing device, the second dosing device, the third dosing device, the connecting pipeline and the like are skid-mounted. Therefore, the multifunctional pretreatment device for the complex waste liquid in the oil and gas field is convenient to transport, and is suitable for on-site treatment of scattered waste liquid in remote areas.
In order to solve the technical problem, the technical scheme also provides a pretreatment method of the complex waste liquid in the oil and gas field, which comprises the following steps:
adding medicine and mixing: adding a coagulant into the waste liquid by a first dosing device, and then mixing the waste liquid in a pipeline mixer;
adding drugs and performing pre-flocculation: outputting the mixed waste liquid by a pipeline mixer and adding a flocculating agent by a second dosing device;
air entraining flocculation step: the waste liquid enters an air-entrapping flocculation device, and air is injected into the waste liquid from a bubble generator in a microbubble generation and cavitation oxidation zone to carry out microbubble gel breaking and aeration oxidation reaction; then the waste liquid enters a rotational flow flocculation reaction zone and a vortex flocculation reaction zone from bottom to top in sequence for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters a settling zone for settling, and the settled waste liquid is output by a treatment liquid discharge pipe of the air-entrapping flocculation device;
a step of reinforced flocculation separation: the waste liquid enters a reinforced flocculation separation device, and floating oil on the upper layer of the waste liquid is collected for the first time by an oil collecting tank in a contact zone; then the waste liquid overflows into a separation zone for sedimentation, and the sediment generated by sedimentation is discharged through a sludge discharge pipe; then the waste liquid enters a first mixing zone, a first reaction zone and a second mixing zone in sequence through a flow channel, stirring devices are arranged in the first mixing zone and the second mixing zone to stir the waste liquid, sodium hypochlorite is added into the waste liquid by a third dosing device in the first reaction zone to carry out chemical oxidation reaction, and simultaneously a coagulant is added into the waste liquid by the first dosing device to carry out clarification reaction; then the waste liquid enters a second reaction zone from a second mixing zone through a flow channel, a flocculating agent is added into the waste liquid by a second dosing device for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters an inclined plate sedimentation area through a flow channel for inclined plate sedimentation, and meanwhile, floating oil on the upper layer of the waste liquid is collected for the second time by an oil receiving groove in the inclined plate sedimentation area; then the waste liquid overflows into a clear water area;
a step of discharging pretreated waste liquid: the clear water area is connected with a drain pipe to discharge the pretreated waste liquid.
Therefore, the pretreatment method can realize the processes of multistage dosing coagulation, microbubble gel breaking, flocculation, multistage oxidation, sedimentation and dosing clarification, not only optimizes the waste liquid treatment process, but also ensures the high efficiency of waste liquid treatment and can meet the treatment requirements of waste liquids with different properties.
As another implementation of the technical scheme, a step of reflux reinforced flocculation separation is added before the step of discharging the pretreated waste liquid: and when the waste liquid detected from the sampling port does not reach the standard, the waste liquid in the clear water area flows back to the contact area through the return pipe and the dissolved air pump to perform dissolved air floatation reaction and perform the step of enhanced flocculation separation again, and the step of discharging the pretreated waste liquid is performed until the waste liquid detected from the sampling port reaches the standard. Therefore, the efficiency of waste liquid treatment can be improved through the dissolved air flotation reaction, and the repeated execution of the step of strengthening flocculation separation can ensure that the waste liquid reaches the discharge standard when being discharged.
As another implementation of the technical scheme, a waste liquid treatment process surpassing step is added before the dosing mixing step: the sampling ports are arranged on the waste liquid incoming pipeline and the treatment liquid discharge pipe of the air-entrapping flocculation device, the waste liquid incoming pipeline, the pipeline at the water inlet end of the air-entrapping flocculation device and the treatment liquid discharge pipe are respectively connected with branch bypass pipelines with valves, the branch bypass pipelines are communicated with one another, the valves on the branch bypass pipelines are closed or opened through the standard reaching condition of the waste liquid detected by the sampling ports, and the pretreatment operation of the complex waste liquid in the oil and gas field is started from any one of the dosing mixing step, the air-entrapping flocculation step or the reinforced flocculation separation step. Therefore, the starting point of the treatment step is selected according to the components and the properties of the waste liquid, so that the treatment process is simplified and the energy consumption is saved; in addition, the flow surpassing can also facilitate the overhaul and maintenance of the pipeline mixer or the air-entrapping flocculation device and the related pipeline device.
Drawings
FIG. 1 is a schematic view of one embodiment of the multifunctional pretreatment device for complex waste liquid in oil and gas fields;
FIG. 2 is a side cross-sectional view of an aerated flocculation apparatus of the present invention;
FIG. 3 is a side sectional view of the enhanced flocculation separation apparatus of the present invention;
FIG. 4 is a top view of the enhanced flocculation separation apparatus of the present invention;
FIG. 5 is a schematic view of another embodiment of the multifunctional pretreatment device for complex waste liquid in oil and gas fields.
Symbolic illustration in the drawings:
1 waste liquid incoming water pipeline; 2, lifting a pump; 3 a pipeline mixer; 4, aerating a flocculation device; 41 an outer cylinder; 411 air vent; 412 ports; 413 a treatment liquid outlet; 414 liquid discharge pipes; 415 a support bar; 42 an inner cylinder body; 421 cylinder segments; 4211 opening; 4212 a fluid director; 422 a waist-contracting section; 423 a funnel section; 424 through holes; 43 bubble liquid inlet pipe; 431 sludge discharge pipes; 44 a water inlet loop pipe; 441 water inlet hole; 45 bubble generator lines; 451 bubble generator; 5, a reinforced flocculation separation device; 51 a waste liquid inlet pipe; 52 a contact chamber; 521 a partition plate; 522 a first oil receiving groove; 523 oil residue chamber; 53 dividing the chamber; 531 first sludge hopper; 532 a mud pipe; 54 a first mixing chamber; 541 a stirring device; 55 a first reaction chamber; 56 a second mixing chamber; 561 a stirring device; 57 a second reaction chamber; 571 a second sludge hopper; 572 sludge discharge pipe; 58 sloping plate settling chambers; 581 a second oil receiving groove; 59 a clear water chamber; 591 a return pipe; 592 to a dissolved air pump; 6, a first dosing device; 61 a first dosing line; 62 a third dosing line; 7, a second dosing device; 71 a second dosing line; 72 fourth dosing line; 8, a third dosing device; 81 a fifth dosing line; 9 a valve; 10 water discharge pipes; 11 a sampling port; 12 a first branch bypass; 13 a second branch bypass; 14 the third branch by-passes.
Detailed Description
The following detailed description and technical contents of the present invention are described with reference to the drawings, which are provided for reference and illustration purposes only and are not intended to limit the present invention.
Fig. 1 is a schematic view of an embodiment of the multifunctional pretreatment device for complex waste liquid in oil and gas fields. This multi-functional preprocessing device of complicated waste liquid in oil gas field includes: the device comprises a lift pump 2, a pipeline mixer 3, an air-entrapping flocculation device 4, a reinforced flocculation separation device 5, a first dosing device 6, a second dosing device 7 and a third dosing device 8. Wherein, the waste liquid pipeline 1 that comes connects the pump of elevator pump 2 and goes into the end, and the pump output of elevator pump 2 passes through the input of pipeline connection pipeline mixer 3, and the output of pipeline mixer 3 passes through the end of intaking of pipeline connection air entrainment flocculation device 4, and the play water end of air entrainment flocculation device 4 passes through the end of intaking of pipeline connection intensive flocculation separation device 5, and the play water end of intensive flocculation separation device 5 is connected drain pipe 10. The first chemical adding device 6 is connected with the pipeline of the input end of the pipeline mixer 3 through a first chemical adding pipeline 61, a valve 9 is arranged on the first chemical adding pipeline 61, the second chemical adding device 7 is connected with the pipeline of the output end of the pipeline mixer 3 through a second chemical adding pipeline 71, a valve 9 is arranged on the second chemical adding pipeline 71, the first chemical adding device 6 is further communicated with a first reaction chamber 55 (shown in a combined graph 4) of the enhanced flocculation separation device 5 through a third chemical adding pipeline 62, a valve 9 is arranged on the third chemical adding pipeline 62, the second chemical adding device 7 is further communicated with a second reaction chamber 57 (shown in a combined graph 4) of the enhanced flocculation separation device 5 through a fourth chemical adding pipeline 72, a valve 9 is arranged on the fourth chemical adding pipeline 72, and the third chemical adding device 8 is communicated with the first reaction chamber 55 of the enhanced flocculation separation device 5 through a fifth chemical adding pipeline 81, and a valve 9 is arranged on the fifth chemical adding pipeline 81. The air-entrapping flocculation device 4 can convey the waste liquid conveyed into the air-entrapping flocculation device into the reinforced flocculation separation device 5 through a pipeline after micro-bubble gel breaking, aeration oxidation, flocculation and sedimentation treatment. The enhanced flocculation separation device 5 can perform dissolved air flotation, floating oil collection, chemical oxidation, dosing clarification, flocculation, inclined plate sedimentation and secondary floating oil collection on the waste liquid conveyed into the enhanced flocculation separation device and then discharge the waste liquid through a drain pipe 10.
Specifically, as shown in fig. 2, in the present embodiment, the air entrainment flocculation apparatus 4 includes: an outer cylinder 41, a treatment liquid discharge pipe 414, an inner cylinder 42, a bubble liquid inlet pipe 43, a water inlet ring pipe 44, at least one bubble generator pipeline 45 and a sludge discharge pipe 431. Wherein, the outer cylinder 41 is in a capsule shape and is vertically arranged, the upper end of the outer cylinder 41 is provided with an exhaust hole 411 communicated with the outside, the central position of the lower end of the outer cylinder 41 is provided with a through hole 412 and at least one treatment liquid outlet 413 surrounding the through hole 412, and the at least one treatment liquid outlet 413 is connected with a treatment liquid discharge pipe 414. The inner cylinder 42 and the outer cylinder 41 are coaxial and are fixedly connected between the outer side surface of the inner cylinder 42 and the inner side surface of the outer cylinder 41 through a plurality of support rods 415, so that the inner cylinder 42 is arranged inside the outer cylinder 41, and a space is arranged between the outer side surface of the inner cylinder 42 and the inner side surface of the outer cylinder 41, thereby forming a settling space. The inner cylinder 42 comprises a cylinder section 421, a waist-closing section 422 and a funnel section 423 from top to bottom, wherein the upper end part of the cylinder section 421 is an open opening 4211, the inner side surface of the cylinder section 421 is provided with a double-layer flow guide structure at intervals, the flow guide structure is composed of a plurality of flow deflectors 4212 which are uniformly arranged on the inner side surface of the cylinder section 421 at intervals and have isosceles triangle-shaped transverse sections, two equal waist edges of the transverse section of each flow deflector 4212 are in an inwards concave arc shape, and the flow deflectors 4212 of the upper-layer flow guide structure are staggered with the flow deflectors 4212 of the lower-layer flow guide structure; the waist-closing section 422 is combined with the lower end part of the cylindrical section 421, and the diameter of the middle part of the waist-closing section 422 is smaller than that of the upper end part and the lower end part of the waist-closing section; funnel section 423 combines in the lower tip of closing waist section 422, and the diameter of funnel section 423 from top to bottom diminishes, and through-hole 424 has been seted up to the lower tip of funnel section 423 corresponding opening 412 position, and bubble liquid advances pipe 43 and wears to establish sealing combination in opening 412, and bubble liquid advances the upper end and the through-hole 424 intercommunication of pipe 43, and bubble liquid advances the lower tip of pipe 43 and is located the opening 412 outside and for the closed form. The water inlet ring pipe 44 is annularly arranged on the upper part of the outer side surface of the outer cylinder 41, the water inlet ring pipe 44 is provided with a water inlet hole 441 to connect the output end of the pipeline mixer through a pipeline, the water inlet ring pipe 44 is also provided with at least one waste liquid output port (not shown), the bubble liquid inlet pipe 43 is provided with at least one waste liquid input port (not shown) corresponding to the at least one waste liquid output port, at least one bubble generator pipeline 45 is indirectly arranged between the at least one waste liquid output port and the at least one waste liquid input port, and the bubble generator pipeline 45 is provided with a bubble generator 451. The bottom of the bubble liquid inlet pipe 43 is also provided with a slag discharge port (not shown), and the slag discharge port is connected with a sludge discharge pipe 431. Through the structure, the waste liquid enters the water inlet ring pipe 44 through the water inlet hole 441 and is injected into the funnel section 423 at the lower part of the inner cylinder 42 through at least one bubble generator pipeline 45, in the process, the bubble generator 451 in the bubble generator pipeline 45 introduces the outside air into the pipeline to carry out micro-bubble foaming so as to break gel and aerate and oxidize the micro-bubbles of the waste liquid, the waste liquid entering the funnel section 423 is subjected to rotational flow flocculation under the action of the flow direction of the liquid flow, then the liquid flow is stabilized through the waist section 422, the waste liquid enters the cylinder section 421 and is subjected to vortex flocculation through the double-layer flow guide structure inside the cylinder section, the precipitate generated by the rotational flow and the vortex flocculation is discharged through the slag discharge hole at the bottom of the bubble liquid inlet pipe 43, the flocculated waste liquid overflows to the sedimentation space formed between the inner cylinder 42 and the outer cylinder 41 through the opening 4211 at the upper part of the cylinder section 421 to carry out sedimentation, and simultaneously the gas released from the waste liquid is discharged through the vent hole 411, the settled waste liquid is introduced into the next treatment apparatus through the treatment liquid outlet 413 via the treatment liquid discharge pipe 414. Therefore, the internal structure of the air-entrapping flocculation device is compact, the waste liquid treatment efficiency is high, and the micro-bubble gel breaking, aeration oxidation, rotational flow, vortex flocculation and sedimentation processes can be performed on the waste liquid conveyed into the air-entrapping flocculation device.
As shown in fig. 1, 3 and 4, in the present embodiment, the enhanced flocculation separation device 5 comprises, from the water inlet end to the water outlet end: a contact chamber 52, two oil residue chambers 523, a separation chamber 53, a first mixing chamber 54, a first reaction chamber 55, a second mixing chamber 56, a second reaction chamber 57, an inclined plate settling chamber 58 and a clean water chamber 59. The contact chamber 52 is connected with the waste water inlet pipe 51, the two sludge chambers 523 are respectively arranged at two sides of the contact chamber 52, the separation chamber 53 is arranged at the other side of the contact chamber 52 relative to the waste water inlet pipe 51, the separation chamber 53 is separated from the contact chamber 52 and the two sludge chambers 523 by a partition plate 521, the upper end of the partition plate is obliquely arranged towards the separation chamber 53, a first oil receiving groove 522 is arranged above the contact chamber 52 and at the same height as the upper end of the partition plate 521, and two ends of the first oil receiving groove 522 are respectively communicated with the upper parts of the two sludge chambers 523. The waste liquid overflows from the contact chamber 52 into the separation chamber 53, a first sludge hopper 531 is formed at the bottom of the separation chamber 53, and a sludge discharge pipe 532 is installed in the first sludge hopper 531. The first mixing chamber 54, the first reaction chamber 55 and the second mixing chamber 56 are disposed side by side on the other side of the separating chamber 53 opposite to the partition plate 521, the separating chamber 53 is communicated with the first mixing chamber 54 through a flow passage (not shown), the first mixing chamber 54 is communicated with the first reaction chamber 55 through a flow passage, the first reaction chamber 55 is communicated with the second mixing chamber 56 through a flow passage, and the first mixing chamber 54 and the second mixing chamber 56 are both provided with stirring devices 541, 561. The second reaction chamber 57 is disposed on the other side of the first mixing chamber 54, the first reaction chamber 55 and the second mixing chamber 56 which are disposed side by side, the second reaction chamber 57 is communicated with the second mixing chamber 56 through a flow channel, a second sludge bucket 571 is formed at the bottom of the second reaction chamber 57, and a sludge discharge pipe 572 is installed on the second sludge bucket 571. The inclined plate settling chamber 58 is disposed at the other side of the second reaction chamber 57, the second reaction chamber 57 is communicated with the inclined plate settling chamber 58 through a flow passage, and a second oil receiving tank 581 is disposed above the inclined plate settling chamber 58. The clear water chamber 59 is arranged at the other side of the inclined plate settling chamber 58, the waste liquid overflows from the inclined plate settling chamber 58 and enters the clear water chamber 59, and the clear water chamber 59 is connected with the drainage pipe 10. The third and fifth drug feeding lines 62, 81 are connected to the first reaction chamber 55, and the fourth drug feeding line 72 is connected to the second reaction chamber 57. Through the structure, the waste liquid enters the contact chamber 52 through the waste liquid inlet pipe 51 and flows to the separation chamber 53 through overflow, in the overflow process, the floating oil on the upper layer of the waste liquid is collected through the first oil receiving tank 522 and is discharged into the oil residue chamber 523 on both sides of the contact chamber 52, the waste liquid is settled in the separation chamber 53, the settled precipitate is deposited in the first sludge hopper 531 and is discharged from the sludge discharge pipe 532 through static pressure, then the waste liquid sequentially enters the first mixing chamber 54, the first reaction chamber 55 and the second mixing chamber 56 through a flow passage, the waste liquid in the first mixing chamber 54 and the second mixing chamber 56 can be fully stirred by the stirring devices 541 and 561 to improve the effect of relevant reactions, the first reaction chamber 55 is added with medicaments by the first and third medicament adding devices 6 and 8 to carry out chemical oxidation and clarification reactions, the waste liquid enters the second reaction chamber 57 through the flow passage after being added with medicaments and is added with medicaments by the second medicament adding device 7 to carry out flocculation treatment, the sediment generated by flocculation is deposited in the second sludge hopper 571 and discharged from the sludge discharge pipe 572 through static pressure, and simultaneously the waste liquid enters the inclined plate sedimentation chamber 58 for sedimentation, the deposited sediment is deposited in the second sludge hopper 571 and discharged from the sludge discharge pipe 572, and then the waste liquid overflows from the inclined plate sedimentation chamber 58 to enter the clear water chamber 59 and is discharged through the drain pipe 10. Therefore, the reinforced flocculation separation device has a compact internal structure and high waste liquid treatment efficiency, and can carry out floating oil collection, chemical oxidation, dosing clarification, flocculation, inclined plate sedimentation and secondary floating oil collection on waste liquid conveyed into the reinforced flocculation separation device.
As shown in fig. 1, the waste liquid inlet pipe 51, and the waste water outlet pipe 10 may be provided with sampling ports 11 for detecting the components and properties of the waste liquid in each treatment step. And the clear water chamber 59 can be connected with a return pipe 591, the return pipe 591 is connected with a return port (not marked in the figure) of the contact chamber 52 through the dissolved air pump 592, so that the waste liquid which does not reach the discharge standard can be returned to the contact chamber through the return pipe and the dissolved air pump to be repeatedly subjected to the enhanced flocculation separation treatment according to the standard reaching situation of the detection of the treated waste liquid, and meanwhile, the dissolved air flotation treatment can be carried out on the waste liquid.
In this embodiment, the first dosing device can be a coagulant dosing device, the second dosing device can be a flocculant dosing device, and the third dosing device can be a sodium hypochlorite dosing device.
As shown in fig. 5, in another embodiment of the multifunctional pretreatment device for complex waste liquid in oil and gas fields of the present invention, a first branch bypass 12 may be connected to a pipeline from the pump outlet of the lift pump 2 to the input end of the pipeline mixer 3, a second branch bypass 13 may be connected to a pipeline from the output end of the pipeline mixer 3 to the water inlet end of the air-entrained flocculation device 4, a third branch bypass 14 may be connected to a pipeline from the water outlet end of the air-entrained flocculation device 4 to the water inlet end of the enhanced flocculation separation device 5, and the first, second and third branch bypasses 12, 13 and 14 are all provided with a valve 9, and the first, second and third branch bypasses 12, 13 and 14 are connected to each other. The flow of the multifunctional pretreatment device for the complex waste liquid in the oil-gas field can exceed, and the treatment of the waste liquid is started from the pipeline mixer, the air-entrapping flocculation device or the enhanced flocculation separation device by controlling valves on the first, second and third branch bypass paths according to the components and properties of the waste liquid; in addition, the flow surpasses and can be convenient for the overhaul and the maintenance of the pipeline mixer, the air-entrapping flocculation device and the related pipeline device.
The devices such as the lift pump, the pipeline mixer, the air-entrapping flocculation device, the enhanced flocculation separation device, the first dosing device, the second dosing device, the third dosing device, the connecting pipeline and the like in the multifunctional pretreatment device for the complex waste liquid in the oil and gas field can be skid-mounted (not shown in the figure), so that the device is convenient to transport, and is suitable for on-site treatment of scattered waste liquid in remote areas.
The invention also provides a pretreatment method of the complex waste liquid in the oil and gas field by combining the pretreatment device, which comprises the following steps:
adding medicine and mixing: adding a coagulant into the waste liquid by a first dosing device, and then mixing the waste liquid in a pipeline mixer;
adding drugs and performing pre-flocculation: outputting the mixed waste liquid by a pipeline mixer and adding a flocculating agent by a second dosing device;
air entraining flocculation step: the waste liquid enters an air-entrapping flocculation device, and air is injected into the waste liquid by a bubble generator in a microbubble generation and cavitation oxidation zone to carry out microbubble gel breaking and aeration oxidation reaction; then the waste liquid enters a rotational flow flocculation reaction zone and a vortex flocculation reaction zone from bottom to top in sequence for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters a settling zone for settling, and the settled waste liquid is output by a treatment liquid discharge pipe of the air-entrapping flocculation device;
a step of reinforced flocculation separation: the waste liquid enters a reinforced flocculation separation device, and floating oil on the upper layer of the waste liquid is collected for the first time by an oil collecting tank in a contact zone; then the waste liquid overflows into a separation zone for sedimentation, and the sediment generated by sedimentation is discharged through a sludge discharge pipe; then the waste liquid enters a first mixing zone, a first reaction zone and a second mixing zone in sequence through a flow channel, stirring devices are arranged in the first mixing zone and the second mixing zone to stir the waste liquid, sodium hypochlorite is added into the waste liquid by a third dosing device in the first reaction zone to carry out chemical oxidation reaction, and simultaneously a coagulant is added into the waste liquid by the first dosing device to carry out clarification reaction; then the waste liquid enters a second reaction zone from a second mixing zone through a flow channel, a flocculating agent is added into the waste liquid by a second dosing device for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters an inclined plate sedimentation area through a flow channel for inclined plate sedimentation, and meanwhile, floating oil on the upper layer of the waste liquid is collected for the second time by an oil receiving groove in the inclined plate sedimentation area; then the waste liquid overflows into a clear water area;
a step of discharging pretreated waste liquid: the clear water area is connected with a drain pipe to discharge the pretreated waste liquid.
Therefore, the pretreatment method can realize the processes of multistage dosing coagulation, microbubble gel breaking, flocculation, multistage oxidation, sedimentation and dosing clarification, not only optimizes the waste liquid treatment process, but also ensures the high efficiency of waste liquid treatment and can meet the treatment requirements of waste liquids with different properties.
In the pretreatment method, a reflux reinforced flocculation separation step can be added before the pretreatment waste liquid discharge step: and when the waste liquid detected from the sampling port does not reach the standard, the waste liquid in the clear water area flows back to the contact area through the return pipe and the dissolved air pump to perform dissolved air floatation reaction and perform the step of enhanced flocculation separation again, and the step of discharging the pretreated waste liquid is performed until the waste liquid detected from the sampling port reaches the standard. Therefore, the efficiency of waste liquid treatment can be improved through the dissolved air flotation reaction, and the repeated execution of the step of strengthening flocculation separation can ensure that the waste liquid reaches the discharge standard when being discharged.
In the pretreatment method, a waste liquid treatment process surpassing step can be added before the dosing and mixing step: the sampling ports are arranged on the waste liquid incoming pipeline and the treatment liquid discharge pipe of the air-entrapping flocculation device, the waste liquid incoming pipeline, the pipeline at the water inlet end of the air-entrapping flocculation device and the treatment liquid discharge pipe are respectively connected with branch bypass pipelines with valves, the branch bypass pipelines are communicated with one another, the valves on the branch bypass pipelines are closed or opened through the standard reaching condition of the waste liquid detected by the sampling ports, and the pretreatment operation of the complex waste liquid in the oil and gas field is started from any one of the dosing mixing step, the air-entrapping flocculation step or the reinforced flocculation separation step. Therefore, the starting point of the treatment step is selected according to the components and the properties of the waste liquid, so that the treatment process is simplified and the energy consumption is saved; in addition, the flow surpassing can also facilitate the overhaul and maintenance of the pipeline mixer or the air-entrapping flocculation device and the related pipeline device.
The invention can optimize the whole structure of the pretreatment device by applying the air-entrapping flocculation device and the reinforced flocculation separation device in series, thereby reducing the whole scale of the pretreatment device and ensuring the high-efficiency operation of the waste liquid treatment process; in addition, the pretreatment device can realize the flow processes of multistage dosing coagulation, multistage oxidation and dosing clarification by controlling valves on all dosing pipelines so as to meet the treatment requirements of waste liquids with different properties.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and other equivalent changes made by applying the patent concepts of the present invention should fall within the scope of the present invention.
Claims (10)
1. The utility model provides a multi-functional preprocessing device of complicated waste liquid in oil gas field which characterized in that includes: the system comprises a lift pump, a pipeline mixer, an air-entrapping flocculation device, a reinforced flocculation separation device, a first dosing device, a second dosing device and a third dosing device; the waste liquid inlet pipeline is connected with the pump inlet end of the lift pump, the pump outlet end of the lift pump is connected with the input end of the pipeline mixer through a pipeline, the output end of the pipeline mixer is connected with the water inlet end of the air-entrapping flocculation device through a pipeline, the water outlet end of the air-entrapping flocculation device is connected with the water inlet end of the enhanced flocculation separation device through a pipeline, the water outlet end of the enhanced flocculation separation device is connected with the water discharge pipe, the first dosing device is connected with the pipeline at the input end of the pipeline mixer through a first dosing pipeline and is provided with a valve on the first dosing pipeline, the second dosing device is connected with the pipeline at the output end of the pipeline mixer through a second dosing pipeline and is provided with a valve on the second dosing pipeline, the first dosing device is also communicated with the first reaction chamber of the enhanced flocculation separation device through a third dosing pipeline and is provided with a valve on the third dosing pipeline, the second dosing device is also communicated with a second reaction chamber of the enhanced flocculation separation device through a fourth dosing pipeline, a valve is arranged on the fourth dosing pipeline, the third dosing device is communicated with the first reaction chamber of the enhanced flocculation separation device through a fifth dosing pipeline, and a valve is arranged on the fifth dosing pipeline; the aeration flocculation device carries out microbubble gel breaking, aeration oxidation, flocculation and sedimentation treatment on waste liquid conveyed into the aeration flocculation device, and then conveys the waste liquid into the reinforced flocculation separation device through a pipeline, and the reinforced flocculation separation device carries out dissolved air floatation, floating oil collection, chemical oxidation, dosing clarification, flocculation, inclined plate sedimentation and secondary floating oil collection on the waste liquid conveyed into the reinforced flocculation separation device and then discharges the waste liquid through the drainage pipe.
2. The multifunctional pretreatment device for the complex waste liquid in the oil and gas field according to claim 1, wherein the air-entrapping flocculation device comprises: the device comprises an outer cylinder, a treatment liquid discharge pipe, an inner cylinder, a bubble liquid inlet pipe, a water inlet ring pipe, at least one bubble generator pipeline and a sludge discharge pipe; the outer cylinder body is in a capsule shape and is vertically arranged, the upper end part of the outer cylinder body is provided with an exhaust hole communicated with the outside, the central position of the lower end part of the outer cylinder body is provided with a through hole and at least one treatment liquid outlet which surrounds the through hole, and the at least one treatment liquid outlet is connected with the treatment liquid discharge pipe; the inner cylinder and the outer cylinder are coaxial and are fixedly connected between the outer side surface of the inner cylinder and the inner side surface of the outer cylinder through a plurality of support rods, so that the inner cylinder is arranged in the outer cylinder, and a space is formed between the outer side surface of the inner cylinder and the inner side surface of the outer cylinder at intervals; the interior barrel includes the drum section from top to bottom, receives waist section and funnel section, the upper end of drum section is open uncovered, the medial surface interval ring of drum section is equipped with double-deck water conservancy diversion structure, the water conservancy diversion structure is set up the transverse section that is isosceles triangle on drum section medial surface by the even interval of several and constitutes, just two equal waist limits of fluid director transverse section are the indent circular-arc to the fluid director of upper strata water conservancy diversion structure is staggered with the fluid director of lower floor's water conservancy diversion structure mutually, receive waist section combination in the lower tip of drum section, just the diameter of receiving waist section middle part is less than its upper and lower tip's diameter, the funnel section combines in receive the lower tip of waist section, just the diameter of funnel section is from top to bottom little gradually, the lower tip of funnel section corresponds the through-hole has been seted up to the opening position, bubble liquid advances the pipe and wears to establish sealed combination in the opening, the upper end part of the bubble liquid inlet pipe is communicated with the through hole, and the lower end part of the bubble liquid inlet pipe is positioned outside the through hole and is closed; the water inlet ring pipe is annularly fixed at the upper part of the outer side surface of the outer cylinder body, a water inlet hole is formed in the water inlet ring pipe to be connected with the output end of the pipeline mixer through a pipeline, at least one waste liquid output port is further formed in the water inlet ring pipe, at least one waste liquid input port is formed in the bubble liquid inlet pipe corresponding to the at least one waste liquid output port, the at least one bubble generator pipeline is arranged between the at least one waste liquid output port and the at least one waste liquid input port in an indirect mode, and a bubble generator is arranged on the bubble generator pipeline; and a slag discharge port is also formed in the bottom of the bubble liquid inlet pipe and is connected with the sludge discharge pipe.
3. The multifunctional pretreatment device for the complex waste liquid in the oil and gas field according to claim 1, wherein the reinforced flocculation separation device comprises from the water inlet end to the water outlet end of the device: the device comprises a contact chamber, two oil residue chambers, a separation chamber, a first mixing chamber, a first reaction chamber, a second mixing chamber, a second reaction chamber, an inclined plate settling chamber and a clear water chamber; the contact chamber is connected with a waste liquid inlet pipe, the two oil residue chambers are respectively arranged at two sides of the contact chamber, the separation chamber is arranged at the other side of the contact chamber relative to the waste liquid inlet pipe, the separation chamber is separated from the contact chamber and the two oil residue chambers by a partition plate with the upper end part obliquely arranged towards the separation chamber, a first oil receiving groove is arranged above the contact chamber and at the position with the same height as the upper end part of the partition plate, two ends of the first oil receiving groove are respectively communicated with the upper parts of the two oil residue chambers, the waste liquid enters the separation chamber from the contact chamber through overflow, a first sludge hopper is formed at the bottom of the separation chamber, a sludge discharge pipe is arranged on the first sludge hopper, and the first mixing chamber, the first reaction chamber and the second mixing chamber are arranged side by side at the other side of the separation chamber relative to the partition plate, the separation chamber is communicated with the first mixing chamber through a runner, the first mixing chamber is communicated with the first reaction chamber through a runner, the first reaction chamber is communicated with the second mixing chamber through a runner, stirring devices are respectively arranged on the first mixing chamber and the second mixing chamber, the second reaction chamber is arranged on the other side of the first mixing chamber, the first reaction chamber and the second mixing chamber which are arranged side by side, the second reaction chamber is communicated with the second mixing chamber through a runner, a second sludge hopper is formed at the bottom of the second reaction chamber, a sludge discharge pipe is arranged on the second sludge hopper, the inclined plate settling chamber is arranged on the other side of the second reaction chamber, the second reaction chamber is communicated with the inclined plate settling chamber through a runner, a second oil receiving groove is arranged above the inclined plate settling chamber, and the clear water chamber is arranged on the other side of the inclined plate settling chamber, the waste liquid enters the clear water chamber through overflow from the inclined plate settling chamber, the clear water chamber is connected with the drain pipe, the third and fifth dosing pipelines are both connected with the first reaction chamber, and the fourth dosing pipeline is connected with the second reaction chamber.
4. The multifunctional pretreatment device for complex waste liquid in oil and gas fields according to claim 3, wherein the waste liquid incoming water pipeline, the waste liquid inlet pipe and the drain pipe are all provided with sampling ports, the clear water chamber is connected with a return pipe, and the return pipe is connected with the return port of the contact chamber through a dissolved air pump.
5. The multifunctional pretreatment device for the complex waste liquid in the oil and gas field according to claim 1, wherein the first dosing device is a coagulant dosing device, the second dosing device is a flocculant dosing device, and the third dosing device is a sodium hypochlorite dosing device.
6. The multifunctional pretreatment device for the complex waste liquid in the oil and gas field according to claim 1, wherein a first branch bypass is connected to a pipeline from the pump-out end of the lift pump to the input end of the pipeline mixer, a second branch bypass is connected to a pipeline from the output end of the pipeline mixer to the water inlet end of the air-entrapping flocculation device, a third branch bypass is connected to a pipeline from the water outlet end of the air-entrapping flocculation device to the water inlet end of the enhanced flocculation separation device, valves are arranged on the first branch bypass, the second branch bypass and the third branch bypass, and the first branch bypass, the second branch bypass and the third branch bypass are communicated with each other.
7. The multifunctional pretreatment device for the complex waste liquid in the oil and gas field according to claim 1, wherein the lift pump, the pipeline mixer, the air-entrapping flocculation device, the reinforced flocculation separation device, the first dosing device, the second dosing device, the third dosing device and the connecting pipeline are skid-mounted.
8. The pretreatment method of the complex waste liquid in the oil and gas field is characterized by comprising the following steps:
adding medicine and mixing: adding a coagulant into the waste liquid by a first dosing device, and then mixing the waste liquid in a pipeline mixer;
adding drugs and performing pre-flocculation: outputting the mixed waste liquid by the pipeline mixer and adding a flocculating agent by a second dosing device;
air entraining flocculation step: the waste liquid enters an air-entrapping flocculation device, and air is injected into the waste liquid from a bubble generator in a microbubble generation and cavitation oxidation zone to carry out microbubble gel breaking and aeration oxidation reaction; then the waste liquid enters a rotational flow flocculation reaction zone and a vortex flocculation reaction zone from bottom to top in sequence for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters a settling zone for settling, and the settled waste liquid is output by a treatment liquid discharge pipe of the air-entrapping flocculation device;
a step of reinforced flocculation separation: the waste liquid enters a reinforced flocculation separation device, and floating oil on the upper layer of the waste liquid is collected for the first time by an oil collecting tank in a contact zone; then the waste liquid overflows into a separation zone for sedimentation, and sediment generated by sedimentation is discharged through a sludge discharge pipe; then the waste liquid enters a first mixing zone, a first reaction zone and a second mixing zone in sequence through a flow channel, wherein the first mixing zone and the second mixing zone are both provided with stirring devices for stirring the waste liquid, a third dosing device is used for adding sodium hypochlorite into the waste liquid in the first reaction zone for carrying out chemical oxidation reaction, and a coagulant is added into the waste liquid by the first dosing device for carrying out clarification reaction; then the waste liquid enters a second reaction zone from the second mixing zone through a flow channel, a flocculating agent is added into the waste liquid by the second dosing device for flocculation reaction, and the sediment generated by flocculation is discharged through a sludge discharge pipe; then the waste liquid enters an inclined plate sedimentation area through a flow channel for inclined plate sedimentation, and meanwhile, floating oil on the upper layer of the waste liquid is collected for the second time by an oil receiving groove in the inclined plate sedimentation area; then the waste liquid overflows into a clear water area;
a step of discharging pretreated waste liquid: the clear water area is connected with a drain pipe to discharge the pretreated waste liquid.
9. The pretreatment method of complex waste liquid in oil and gas fields according to claim 8, characterized in that a reflux enhanced flocculation separation step is added before the pretreatment waste liquid discharge step, and the reflux enhanced flocculation separation step: and a sampling port is arranged at the position of the drain pipe of the clear water area, when the waste liquid detected from the sampling port does not reach the standard, the waste liquid in the clear water area flows back to the contact area through a return pipe and a dissolved air pump to perform dissolved air floatation and perform the step of enhanced flocculation separation again, and the step of discharging the pretreated waste liquid is performed until the waste liquid detected from the sampling port reaches the standard.
10. The pretreatment method of complex waste liquid in oil and gas fields according to claim 8, characterized in that a waste liquid treatment process overriding step is added before the dosing mixing step, and the waste liquid treatment process overriding step: the method comprises the steps that sampling ports are arranged on a waste liquid incoming pipeline and a treatment liquid discharge pipe of an air-entrapping flocculation device, branch bypass pipelines with valves are connected to the waste liquid incoming pipeline, a pipeline at the water inlet end of the air-entrapping flocculation device and the treatment liquid discharge pipe respectively, the branch bypass pipelines are communicated with one another, the valves on the branch bypass pipelines are closed or opened through the standard reaching condition of waste liquid detected from the sampling ports, and therefore the pretreatment operation of complex waste liquid in an oil-gas field is started to be executed from any one of a chemical adding mixing step, an air-entrapping flocculation step or a flocculation strengthening separation step.
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| CN119059626A (en) * | 2024-10-23 | 2024-12-03 | 北京石油化工学院 | A kind of polymer flooding production water pipe pretreatment equipment and method |
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