CN102050504B - Treatment method for circulating water - Google Patents
Treatment method for circulating water Download PDFInfo
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- CN102050504B CN102050504B CN 200910236631 CN200910236631A CN102050504B CN 102050504 B CN102050504 B CN 102050504B CN 200910236631 CN200910236631 CN 200910236631 CN 200910236631 A CN200910236631 A CN 200910236631A CN 102050504 B CN102050504 B CN 102050504B
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Abstract
The invention relates to a treatment method for circulating water. The method comprises cyclone separation of the circulating water in order to separate water and substances with density of less than or equal to that of the water. According to the treatment method for the circulating water, water purification can be realized, and the method has good effect on impurities of multiple types such as petroleum media, biological sticky mud and oxides; and the method provided by the invention has wide applicability, simple process, high reliability and high operability.
Description
Technical field
The invention relates to a kind for the treatment of process of recirculated water.
Background technology
Recycling as the important means that improves water utilization rate of industrial colling is widely used for a long time.In day-to-day operation, because the factors such as the biological clay that the ferric oxide that the airborne dust that enters, the incrustation scale of formation, corrosion produce, microbial metabolism produce, processing medium leakage, the circulating cooling water turbidity is constantly increased, can cause water quality to run down, turbidity raises gradually, acceleration equipment corrosion and fouling.
The series of problems that raises and bring in order to solve the circulating cooling water turbidity is usually installed sand filter at system pipeline the recirculated water that accounts for global cycle water yield 5%-10% is uninterruptedly filtered, and the circulating cooling water turbidity is controlled at certain limit.The method filter effect under normal circumstances is good, can remove the suspended substance in the recirculated cooling water.But when recirculated cooling water process stream occurs and leaks (particularly thick oil plant enters recirculated water) or biological clay and grow in a large number, leaked substance or biological clay adhere to filter material surface, make filtrate occur to lump and lose filteration, cause the turbidity removal effect of strainer very poor, cause on the one hand recirculated cooling water to worsen and affect the normal operation of production equipment, cause on the other hand filter backwash water to increase considerably and waste a large amount of water resourcess.Therefore, the turbidity removal technology of development cycle water coolant under abnormal condition is to guaranteeing that recirculating cooling water system normally moves tool and is of great significance.
At present, according to the difference of the high turbidity reason of recirculated water, adopt diverse ways to process.As: for small granular suspended matters, adopt chemical flocculation to process; To biological clay, adopt the high-speed jet purging method, add the chemical method such as tensio-active agent and adopt the biological process of cellulase treatment; To the petroleum-type medium, generally adopt the purolator filter method and utilize biodegradation technique, by the biological enzyme effect oils decomposition method is processed, in addition, patent US7087158 has also invented a kind of employing honeycomb structure porous material, and possesses the filtration unit of oxidation unit.Although these measures have certain turbidity removal effect, still very poor to the filter effect of heavy oil, residual oil and high-activity biological foundry loam; Patent US5023011 has invented a kind of chemical agent that is comprised of phosphate-based polymer and Sunmorl N 60S, can effectively remove water-fast calcium salt or metal oxide and equipment is had corrosion inhibition; Bypass has designed the other filter equipment of functions such as possessing dosing, filtration to patent CN03150904.5 for recirculated water especially, but these inventions are not mentioned it to the cleaning action of oily(waste)water.
Summary of the invention
The object of the invention is to overcome in the prior art in the circulating water treatment method, every kind of method provides a kind of polytype impurity such as petroleum-type medium, biological clay and oxide compound is all had good result circulating water treatment method only to the effective shortcoming of specific impurity.
The invention provides a kind of circulating water treatment method, the method comprises carries out cyclonic separation with described recirculated water, separates water outlet and density less than or equal to the material of water.
According to circulating water treatment method provided by the invention, can realize the purification to water quality, the polytype impurity that comprises petroleum-type medium, biological clay and oxide compound is all had good effect; Method applicability provided by the invention is wide, and technique is simple, and reliability is high, and operability is high.
Embodiment
According to circulating water treatment method provided by the invention, wherein, the method comprises carries out cyclonic separation with described recirculated water, separates water outlet and density less than or equal to the material of water.
Contain and the immiscible impurity of water biogenic foundry loams such as silt, water-fast metal oxide, crude oil and crude oil products, mushroom etc. in the described recirculated water.
Described biological clay refers to the materials such as fiber suede that the zoogloea, algae, protozoon and the insect that form owing to microbial reproduction is out of control and Institute of Micro-biology stick, the grains of sand, mud.
Described petroleum-type medium refers to topped crude or long residuum at the bottom of crude oil, the primary tower.Topped crude refers to before crude oil atmospheric distillation at the bottom of the primary tower, the product that obtains after the carburet hydrogen in the crude oil, part light constituent and a small amount of moisture are steamed.
Described suspended solid comprises silt, water-fast metal oxide, inorganic salt and other solid matters.
Described cyclonic separation is that fluid mixture is injected the cavity of taper from tangential or axial inlet with certain pressure or speed, thereby high speed rotating in cyclone separator, under the effect of centrifugal force, density is large be thrown toward mutually around, and move downward along wall, discharge as underflow; Density is little move to mutually in the middle of and move upward, discharge as overflow at last, thereby reach a kind of separation method of the purpose of separation.
According to the present invention, described cyclonic separation can be carried out in cyclone separator, described cyclonic separation is carried out in cyclone separator, described cyclone separator comprises cyclone separator main body, liquid inlet opening, overflow port and underflow opening, described overflow port is positioned at the top of described cyclone separator main body, described underflow opening is positioned at the bottom of described cyclone separator main body, the method comprises described recirculated water sent into from liquid inlet opening carries out cyclonic separation in the cyclone separator main body, described water and density are discharged from described overflow port less than or equal to the material of water; The density that obtains is discharged from described underflow opening greater than the material of water.
Under the preferable case, the method comprises that also the material that described cyclone separator overflow port is discharged carries out sedimentation.The method of described sedimentation is conventionally known to one of skill in the art.
Described cyclone separator can be the cyclone separation device of routine, such as the fx series hydrocyclone of Weihai pine swirler company limited production.
Wherein, in the described cyclonic separation step, the flow velocity of described recirculated water can be 1m/s-5m/s, is preferably 1.5m/s-2.5m/s.When flow velocity was too high, the shearing action of fluid was strong, oily substance can't fully be separated with the water generates emulsion, or loosely organized solid is dispersed in water, was unfavorable for separating; Cross when low when flow velocity, system can't provide enough centrifugal force.The pressure that described recirculated water carries out cyclonic separation can be 0.1-0.6MPa, is preferably 0.3-0.5MPa, and when hypertonia, the ingress flow velocity is too high, and when hypotony, the ingress flow velocity is excessively low.Wherein, the flow velocity of described recirculated water refers to that the unit time passes through the volume of the water of swirler entrance; The pressure of described cyclonic separation refers to that a certain moment water is at the pressure of swirler ingress.
Below in conjunction with specific embodiment the present invention is further detailed.
Embodiment 1
Certain Water System of Refinery leaks because of production equipment, oil-containing in the recirculated water, and oleaginousness, turbidity and CODcr before it is processed are as shown in table 1.Adopting swirler is that Weihai pine swirler company limited produces fx25 type hydrocyclone, swirler inlet pressure 0.30Mpa, flow velocity is about 1.5m/s, water quality after the processing sees Table 1, recirculated water oleaginousness, turbidity and CODcr after the processing are reduced to respectively 11mg/L, 7NTU and 47mg/L, reach the recirculated water operating requirement.
Wherein, the measuring method of oleaginousness is with reference to CNS GB/T16488-1996: water-quality petroleum and animals and plants Determination of oil infrared spectrophotometry.
The measuring method of turbidity is with reference to CNS GB/T 15893.1-1995: the mensuration scattered light method of turbidity in the industrial circulating cooling water.
The measuring method of CODcr is with reference to CNS GB/T 15456-2008: the mensuration potassium permanganate process of chemical oxygen demand (COD) in the industrial circulating cooling water (COD).
Table 1
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Oleaginousness (mg/L) | 135 | 11 |
| 2 | Turbidity (NTU) | 71 | 7 |
| 3 | CODcr(mg/L) | 246 | 47 |
Embodiment 2
Certain chemical plant recirculated water lost efficacy because of microbiological manipulation, contained a large amount of biological clays in the recirculated water, and biological clay content, turbidity and CODcr before it is processed are as shown in table 2.Adopt present method to process, swirler pressure 0.35Mpa, flow velocity is 1.8m/s, and the water quality after the processing sees Table 2, and the turbidity of circulating water after the processing, biological clay and CODcr are reduced to respectively 7NTU, 8mg/L and 51mg/L, reach the recirculated water operating requirement.
The measuring method of biological clay content is GB 11901-1989: the gravimetry method of water quality suspended substance.
The measuring method of turbidity and CODcr is identical with embodiment 1.
Table 2
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Biological clay content (mL/m 3) | 161 | 8 |
| 2 | Turbidity (NTU) | 74 | 7 |
| 3 | CODcr(mg/L) | 362 | 51 |
Embodiment 3
Certain steel mill's steel-making recirculated water, principal pollutant are the oxide compound of iron.Solid suspension content, turbidity and CODcr before it is processed are as shown in table 3.Swirler pressure 0.35Mpa, flow velocity is 2.5m/s, the water quality after the processing sees Table 3.
Wherein, the measuring method of solid suspension content is: GB 11901-1989: the gravimetry method of water quality suspended substance.
The measuring method of turbidity and CODcr is identical with embodiment 1.
Table 3
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Suspended solid (mg/L) | 65 | 6 |
| 2 | Turbidity (NTU) | 51 | 4 |
| 3 | CODcr | 47 | 31 |
Embodiment 4
Process the recirculated water of identical composition according to the method identical with embodiment 1, difference is, swirler pressure 0.6Mpa, flow velocity are 3m/s.Measure water quality after processing according to the method identical with embodiment 1, the result is as shown in table 4.
Table 4
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Oleaginousness (mg/L) | 135 | 65 |
| 2 | Turbidity (NTU) | 71 | 29 |
| 3 | CODcr(mg/L) | 246 | 154 |
Embodiment 5
Process the recirculated water of identical composition according to the method identical with embodiment 2, difference is, swirler pressure 0.1Mpa, flow velocity are 0.3m/s.Measure water quality after processing according to the method identical with embodiment 2, the result is as shown in table 5.
Table 5
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Biological clay content (mL/m 3) | 161 | 100 |
| 2 | Turbidity (NTU) | 74 | 48 |
| 3 | CODcr(mg/L) | 362 | 224 |
Embodiment 6
Process the recirculated water of identical composition according to the method identical with embodiment 3, difference is, swirler pressure 0.7Mpa, flow velocity are 3.5m/s.Measure water quality after processing according to the method identical with embodiment 3, the result is as shown in table 6.
Table 6
| Sequence number | The control project | Before the processing | After the processing |
| 1 | Suspended solid (mg/L) | 65 | 5 |
| 2 | Turbidity (NTU) | 51 | 3 |
| 3 | CODcr | 47 | 25 |
Can find out from the result of embodiment 1-6, according to circulating water treatment method provided by the invention, suspended solid, petroleum-type medium and the biological clay content that reduces recirculated water there is significant effect, can reduces significantly turbidity and CODcr, realize the purification to water quality.Particularly relatively can find out by the result with embodiment 1-3 and embodiment 4-6, when the pressure of the flow velocity of recirculated water and cyclonic separation was within preferable range, separating effect was better, and power consumption is low.
Claims (6)
1. the treatment process of a recirculated water, it is characterized in that, the method comprises carries out cyclonic separation with described recirculated water, separate water outlet and density less than or equal to the material of water, wherein, the condition of described cyclonic separation comprises that the flow velocity of recirculated water is 1-5m/s, the condition of described cyclonic separation comprises that also the pressure of recirculated water is 0.1-0.6MPa, described circulating water treatment method can realize the purification to water quality, and petroleum-type medium, biological clay and oxide compound are all had good treatment effect; Described petroleum-type medium refers to topped crude or long residuum at the bottom of crude oil, the primary tower, and topped crude refers to before crude oil atmospheric distillation at the bottom of the primary tower, the product that obtains after the carburet hydrogen in the crude oil, part light constituent and a small amount of moisture are steamed; Described biological clay refers to fiber suede, the grains of sand or the mud that the zoogloea, algae, protozoon and the insect that form owing to microbial reproduction is out of control and Institute of Micro-biology stick.
2. method according to claim 1, wherein, the flow velocity of described recirculated water is 1.5-2.5m/s.
3. method according to claim 1 and 2, wherein, the condition of described cyclonic separation comprises that also the pressure of described recirculated water is 0.3-0.5MPa.
4. method according to claim 1, wherein, described cyclonic separation is carried out in cyclone separator, described cyclone separator comprises cyclone separator main body, liquid inlet opening, overflow port and underflow opening, described overflow port is positioned at the top of described cyclone separator main body, described underflow opening is positioned at the bottom of described cyclone separator main body, the method comprises described recirculated water sent into from liquid inlet opening carries out cyclonic separation in the cyclone separator main body, described water and density are discharged from described overflow port less than or equal to the material of water; The density that obtains is discharged from described underflow opening greater than the material of water.
5. method according to claim 4, wherein, the method comprises that also the material that described cyclone separator overflow port is discharged carries out sedimentation.
6. the described method of any one according to claim 1-5, wherein, described recirculated water contains and the immiscible impurity of water.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2597462Y (en) * | 2003-02-08 | 2004-01-07 | 魏科 | High-speed rotational flow precipitation filter |
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| CN2597462Y (en) * | 2003-02-08 | 2004-01-07 | 魏科 | High-speed rotational flow precipitation filter |
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