CN102050504A - Treatment method for circulating water - Google Patents
Treatment method for circulating water Download PDFInfo
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- CN102050504A CN102050504A CN2009102366312A CN200910236631A CN102050504A CN 102050504 A CN102050504 A CN 102050504A CN 2009102366312 A CN2009102366312 A CN 2009102366312A CN 200910236631 A CN200910236631 A CN 200910236631A CN 102050504 A CN102050504 A CN 102050504A
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- recirculated water
- cyclone separator
- cyclonic separation
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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 of treatment 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 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 recirculated cooling water turbidity is constantly increased, can cause water quality to run down, turbidity raises gradually, acceleration equipment corrosion and fouling.
In order to solve a series of problems that the recirculated cooling water turbidity raises and brings, sand filter is installed on system pipeline usually the recirculated water that accounts for global cycle water yield 5%-10% is uninterruptedly filtered, the recirculated cooling water turbidity is controlled at certain limit.This 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 take place 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 influence the normal operation of production equipment, cause filter backwash water to increase considerably on the other hand and waste great amount of water resources.Therefore, the turbidity removal technology of development cycle water coolant under improper situation has crucial meaning to guaranteeing the normal operation of recirculating cooling water system.
At present, according to the difference of the high turbidity reason of recirculated water, adopt diverse ways to handle.As: for small granular suspended matters, adopt chemical flocculation to handle; To biological clay, the biological process that adopts the high-speed jet purging method, adds chemical method such as tensio-active agent and adopt biological enzyme to handle; To the petroleum-type medium, generally adopt the purolator filter method and utilize biodegradation technique, by the biological enzyme effect oils decomposition method is handled, in addition, patent US7087158 has also invented a kind of employing honeycomb structure porous material, and possesses the filtration unit of oxidation unit.Though it is 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 of being made up 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 at recirculated water especially, but its cleaning action to oily(waste)water is not mentioned in these inventions.
Summary of the invention
The objective 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, this method comprises carries out cyclonic separation with described recirculated water, separates water outlet and the density material smaller or equal to water.
According to circulating water treatment method provided by the invention, can realize 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 technology is simple, reliability height, operability height.
Embodiment
According to circulating water treatment method provided by the invention, wherein, this method comprises carries out cyclonic separation with described recirculated water, separates water outlet and the density material smaller or equal to water.
Contain in the described recirculated water and the immiscible impurity of water, for example biogenic foundry loams such as silt, water-fast metal oxide, crude oil and crude oil products, mushroom etc.
Described biological clay is meant materials such as the zoogloea, algae, protozoon and the insect that form owing to microbial reproduction is out of control and Institute of Micro-biology's adherent fiber suede, the grains of sand, mud.
Described petroleum-type medium is meant topped crude or long residuum at the bottom of crude oil, the primary tower.Topped crude is meant before crude oil atmospheric distillation at the bottom of the primary tower, steams back carburet hydrogen in the crude oil, part light constituent and small amount of moisture and product that obtain.
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 action of centrifugal force, density is big 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 isolating purpose.
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, this 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 smaller 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, this method comprises that also the material that described cyclone separator overflow port is discharged carries out sedimentation.Described settled method is conventionally known to one of skill in the art.
Described cyclone separator can be the cyclone separation device of routine, 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 fluidic shearing action was strong, oily substance can't fully be separated with the water generates emulsion, or loosely organized solid is disperseed 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 low excessively.Wherein, the flow velocity of described recirculated water is meant the volume of unit time by the water of swirler inlet; The pressure of described cyclonic separation is meant the pressure of a certain moment water in the swirler ingress.
Below in conjunction with specific embodiment the present invention is further detailed.
Embodiment 1
Certain refinery circulating water system is leaked because of production equipment, oil-containing in the recirculated water, and oleaginousness, turbidity and CODcr before it is handled 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 11mg/L, 7NTU and 47mg/L respectively, reach the recirculated water operating requirement.
Wherein, the measuring method of oleaginousness is with reference to CNS GB/T16488-1996: the mensuration infrared spectrophotometry of water quality petroleum-type and vegetable and animals oils.
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 handled are as shown in table 2.Adopt present method to handle, swirler pressure 0.35Mpa, flow velocity is 1.8m/s, and the water quality after the processing sees Table 2, and recirculated water turbidity, biological clay and CODcr after the processing are reduced to 7NTU, 8mg/L and 51mg/L respectively, reach the recirculated water operating requirement.
Biological clay Determination on content method 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 handled 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
Handle the recirculated water of identical composition according to the method identical with embodiment 1, difference is that swirler pressure 0.6Mpa, flow velocity are 3m/s.Measure water quality after handling 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
Handle the recirculated water of identical composition according to the method identical with embodiment 2, difference is that swirler pressure 0.1Mpa, flow velocity are 0.3m/s.Measure water quality after handling 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
Handle the recirculated water of identical composition according to the method identical with embodiment 3, difference is that swirler pressure 0.7Mpa, flow velocity are 3.5m/s.Measure water quality after handling 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 |
From the result of embodiment 1-6 as can be seen, according to circulating water treatment method provided by the invention, suspended solid, petroleum-type medium and the biological clay content that reduces recirculated water all there is significant effect, can reduces turbidity and CODcr significantly, realize purification water quality.Particularly by with the result of embodiment 1-3 and embodiment 4-6 more as can be seen, 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 (8)
1. the treatment process of a recirculated water is characterized in that, this method comprises carries out cyclonic separation with described recirculated water, separates water outlet and the density material smaller or equal to water.
2. method according to claim 1, wherein, the condition of described cyclonic separation comprises that the flow velocity of recirculated water is 1-5m/s.
3. method according to claim 2, wherein, the flow velocity of described recirculated water is 1.5-2.5m/s.
4. according to claim 2 or 3 described methods, wherein, the condition of described cyclonic separation comprises that also the pressure of described recirculated water is 0.1-0.6MPa.
5. method according to claim 4, wherein, the condition of described cyclonic separation comprises that also the pressure of described recirculated water is 0.3-0.5MPa.
6. 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, this 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 smaller or equal to the material of water; The density that obtains is discharged from described underflow opening greater than the material of water.
7. method according to claim 6, wherein, this method comprises that also the material that described cyclone separator overflow port is discharged carries out sedimentation.
8. according to any described method among claim 1-3 and the 5-7, 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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| CN104628162A (en) * | 2013-11-11 | 2015-05-20 | 中国石油化工股份有限公司 | Biological slime stripping agent and method for stripping biological slime in circulating cooling water system |
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| CN2597462Y (en) * | 2003-02-08 | 2004-01-07 | 魏科 | High-speed rotational flow precipitation filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104628162A (en) * | 2013-11-11 | 2015-05-20 | 中国石油化工股份有限公司 | Biological slime stripping agent and method for stripping biological slime in circulating cooling water system |
| CN104628162B (en) * | 2013-11-11 | 2017-01-11 | 中国石油化工股份有限公司 | Biological slime stripping agent and method for stripping biological slime in circulating cooling water system |
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