CN212102226U - Closed pretreatment device for oil refining wastewater - Google Patents
Closed pretreatment device for oil refining wastewater Download PDFInfo
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- CN212102226U CN212102226U CN201922311645.8U CN201922311645U CN212102226U CN 212102226 U CN212102226 U CN 212102226U CN 201922311645 U CN201922311645 U CN 201922311645U CN 212102226 U CN212102226 U CN 212102226U
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Abstract
An oil refining wastewater closed pretreatment device comprises a regulating tank, a boiling bed separator and a shape coalescer, wherein an output port of the regulating tank is connected with an input port at the top end of the boiling bed separator through a pipeline with a switch, a pipeline at the top of the boiling bed separator is connected with an oil sludge tank through a switch, an output port at the bottom surface of the boiling bed separator is connected with an input end of the shape coalescer through a pipeline with a switch, a water outlet is formed in the lower tank wall at the other end of the shape coalescer, the upper part of the shape coalescer is connected with an oil sludge tank through a pipeline, and an output port of the regulating tank is connected with a back flush inlet at the bottom side of the boiling bed separator after being connected with a back flush pipeline through a pipeline with a switch. The utility model discloses the play water quality of water of device is stable relatively, avoids producing secondary VOCs and flocculation and precipitation dross, and the play water solid content and oiliness rate respectively stable control within 8.0mg/L and 17.2mg/L, and the experiment goes out the water and satisfies biochemical pond requirement of intaking completely.
Description
Technical Field
The utility model relates to a petrochemical environmental protection, especially an airtight preprocessing device of oil refining waste water.
Background
As the key for constructing a green industrial sewage treatment plant, the device replaces structures, and the realization of the closed pretreatment of wastewater is the main trend of subsequent development, basic experiments and engineering application exploration are widely developed in the field by domestic related scientific research institutions and industry leading enterprises, the main trend is to develop efficient air flotation, novel flocculation reagents and realize the closure of traditional structures, but the problems of small adjustment range of treatment thought, secondary pollution caused by pretreatment, low efficiency, no fundamental solution and the like exist. The ebullated bed separation and shape agglomeration processes are two typical separation processes, which are independently verified in industrial practice, but the industrial exploration for realizing pretreatment by combining the ebullated bed separation and shape agglomeration processes is not seen at present, and particularly, the related research for developing targeted optimization aiming at petrochemical wastewater is lacked, and important attention is needed.
The prior art situation is as follows:
1) wangyi; aging; leaf clearness; royal light; zhan Dapeng, an advanced treatment equipment for oil refining sewage, CN 201634524U. This technique adopts pipeline mixing arrangement, many media filter equipment, ozone treatment device and biological activity charcoal filter equipment, with the utility model provides a ebullated bed separation technique is similar, nevertheless gets rid of the effect to emulsified oil and still waits to improve and promote.
2) Yinye dragon; dawn green of Yangxing; opening on land; invar perpetual, a petroleum refining sewage oil-removing pretreatment process, CN 106007209A. The technology adopts a combined treatment scheme taking three-phase hydrocyclone separation and floating oil collection, an adjusting tank, a hydrocyclone coarse granulation polymerization oil-water separator and a dissolved air floatation device as cores, but has high investment and complex flow.
With the utility model discloses well ebullated bed separation get rid of dispersion oil, mud, sand etc. in the oily aquatic, the process thought that the separation of shape coalescence realized emulsified oil breakdown of emulsion, coalescence and separation is similar.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an airtight preprocessing device of oil refining waste water, the key lies in adopting ebullated bed separation and shape coalescence separation combination technology to realize that oily sewage deoiling takes off admittedly, replaces traditional oil removal and air supporting unit, through cancellation flocculation medicament consumption and aeration, avoids producing secondary VOCs and flocculation sediment dross.
The utility model discloses technical solution as follows:
an oil refining wastewater closed pretreatment device comprises a regulating tank, and is characterized by further comprising a boiling bed separator and a shape coalescer, wherein an output port of the regulating tank is connected with an input port at the top end of the boiling bed separator through a pipeline with a switch, a pipeline arranged at the top of the boiling bed separator is connected with an oil sludge tank through a switch, an output port at the bottom surface of the boiling bed separator is connected with an input end of the shape coalescer through a pipeline with a switch, a water outlet is arranged on the lower tank wall at the other end of the shape coalescer, the upper part of the shape coalescer is connected with a sewage tank through a pipeline, and an output port of the regulating tank is connected with a back flush inlet at the bottom side of the boiling bed separator after being connected with a back flush tank pipeline through a pipeline with a switch.
The working process of the utility model is as follows:
the oily sewage firstly enters an adjusting tank, and the primary recovery of the floating oil is realized in the adjusting tank; the effluent of the adjusting tank enters a fluidized bed separator to remove floating oil and suspended matters in the oily sewage; the oil-containing sewage after the primary treatment enters a shape coalescer for further treatment, so that emulsion breaking, coalescence and separation of emulsified oil (oil-in-oil and oil-in-water) are realized, and pretreated effluent is ensured to meet the water quality requirement of subsequent biochemical influent water. In the operation process, the long-period stable operation of the device is realized by periodically back flushing the boiling bed separator and intermittently/continuously discharging oil to the shape coalescer.
Under the conventional operation condition, the backwashing frequency of the boiling bed separator is not more than 2 times/week, and the oil discharge frequency of the shape coalescer is controlled to be 4-6 h/d; under the fluctuation working condition, the backwashing frequency of the boiling bed separator is not more than 1 time/day, and the oil is continuously discharged from the shape coalescer.
The technical effects of the utility model are as follows:
the experiment shows, the utility model discloses the play water quality of water of device is relatively stable, has avoided producing secondary VOCs and flocculation and precipitation dross, and the play water solid content and oiliness rate respectively stable control within 8.0mg/L and 17.2mg/L, and the experiment goes out the water and satisfies biochemical pond requirement of intaking completely.
Drawings
FIG. 1 is a schematic structural view of the closed pretreatment device for oil refining wastewater
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of the closed pretreatment device for oil refining wastewater of the present invention, and it can be seen from the figure that the closed pretreatment device for oil refining wastewater of the present invention comprises a conditioning tank, a fluidized bed separator and a shape coalescer, the output port of the regulating tank is connected with the input port at the top end of the boiling bed separator through a pipeline with a switch, the top of the boiling bed separator is provided with a pipeline which is connected with an oil sludge tank through a switch, the output port of the bottom surface of the boiling bed separator is connected with the input end of the shape coalescer through a pipeline with a switch, the lower tank wall at the other end of the coalescer has a water outlet, the upper part is connected with a slop oil tank through a pipeline, the outlet of the regulating tank is connected with the back washing pipeline through a pipeline with a switch and then is connected with the back washing inlet at the bottom side of the boiling bed separator.
Aiming at actual wastewater, a combined process of a boiling bed separator and a shape coalescer is adopted for real-time treatment, and experimental results show that aiming at regulating tank effluent with the inlet water solid content of 37.0 +/-10.5 mg/L and the oil content of 55.4 +/-32.4 mg/L, the solid content and the oil content of the effluent are respectively reduced to 5.9 +/-1.4 mg/L and 11.5 +/-4.9 mg/L after coupling treatment of the boiling bed separator and the shape coalescer; meanwhile, the water quality of the discharged water of the device is relatively stable, the solid content and the oil content of the discharged water are respectively and stably controlled within 8.0mg/L and 17.2mg/L, and the experimental discharged water completely meets the water inlet requirement of a biochemical pool.
In addition, the oil content of the water outlet of the pilot plant experiment and the oil content of the field dissolved air floatation tank are synchronously compared in the experiment. The data show that the oil content of the water discharged from the site dissolved air floatation in the same period is within the range of 20.9-45.5mg/L, the average oil content is 26.7mg/L, and the water discharged from the air floatation causes certain impact on biochemistry (the oil content of the water inlet is required to be not more than 20mg/L by the conventional biochemical design). The combined process of the fluidized bed separator and the coupled coalescer has overall oil removal efficiency superior to that of the existing air flotation process on the premise of realizing high-efficiency oil removal reaching the standard.
TABLE 1 Experimental data Table for bench scale (unit: mg/L)
Claims (1)
1. An oil refining wastewater closed pretreatment device comprises a regulating tank, and is characterized by further comprising a boiling bed separator and a shape coalescer, wherein an output port of the regulating tank is connected with an input port at the top end of the boiling bed separator through a pipeline with a switch, a pipeline arranged at the top of the boiling bed separator is connected with an oil sludge tank through a switch, an output port at the bottom surface of the boiling bed separator is connected with an input end of the shape coalescer through a pipeline with a switch, a water outlet is arranged on the lower tank wall at the other end of the shape coalescer, the upper part of the shape coalescer is connected with a sewage tank through a pipeline, and an output port of the regulating tank is connected with a back flush inlet at the bottom side of the boiling bed separator after being connected with a back flush pipeline through a pipeline with a switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922311645.8U CN212102226U (en) | 2019-12-20 | 2019-12-20 | Closed pretreatment device for oil refining wastewater |
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| CN201922311645.8U CN212102226U (en) | 2019-12-20 | 2019-12-20 | Closed pretreatment device for oil refining wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624407A (en) * | 2020-12-17 | 2021-04-09 | 华东理工大学 | Deep purification method and device for oilfield acidizing and fracturing wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624407A (en) * | 2020-12-17 | 2021-04-09 | 华东理工大学 | Deep purification method and device for oilfield acidizing and fracturing wastewater |
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